Review Index:

Samsung Magician 4.6 and 840 EVO EXT0DB6Q Firmware Review - Finally Fixed

Subject: Storage
Manufacturer: Samsung


The tale of the Samsung 840 EVO is a long and winding one, with many hitches along the way. Launched at the Samsung 2013 Global SSD Sumit, the 840 EVO was a unique entry into the SSD market. Using 19nm planar TLC flash, the EVO would have had only mediocre write performance if not for the addition of a TurboWrite cache, which added 3-12GB (depending on drive capacity) of SLC write-back cache. This gave the EVO great all around performance in most consumer usage scenarios. It tested very well, was priced aggressively, and remained our top recommended consumer SSD for quite some time. Other editors here at PCPer purchased them for their own systems. I even put one in the very laptop on which I'm writing this article.

View Full Size

An 840 EVO read speed test, showing areas where old data had slowed.

About a year after release, some 840 EVO users started noticing something weird with their systems. The short version is that data that sat unmodified for a period of months was no longer able to be read at full speed. Within a month of our reporting on this issue, Samsung issued a Performance Restoration Tool, which was a combination of a firmware and a software tool that initiated a 'refresh', where all stale data was rewritten, restoring read performance back to optimal speeds. When the tool came out, many were skeptical that the drives would not just slow down again in the future. We kept an eye on things, and after a few more months of waiting, we noted that our test samples were in fact slowing down again. We did note it was taking longer for the slow down to manifest this time around, and the EVOs didn't seem to be slowing down to the same degree, but the fact remained that the first attempt at a fix was not a complete solution. Samsung kept up their end of the bargain, promising another fix, but their initial statement was a bit disappointing, as it suggested they would only be able to correct this issue with a new version of their Samsung Magician software that periodically refreshed the old data. This came across as a band-aid solution, but it was better than nothing.

Read on for our full evaluation of the new firmware and Magician 4.6!

Now we have the fix and I can report on what it is actually doing and accomplishing. I've been working with the new firmware and a beta version of Magician 4.6 (to be released today as I understand). Before getting into the actual results, I'll post the Q+A I had with Samsung as we were testing. This should explain at least what we expect to see:

Q: The new firmware appears to restore read performance without the need for Magician. How was this accomplished?

A: Samsung revised the firmware algorithm to maintain consistency in performance for old data under exceptional circumstances. Therefore, read performance was restored without the need for Magician. This algorithm is based on a periodic refresh feature that can maintain the read performance of this older data. The algorithm does not affect normal user scenarios (i.e. occasional PC performance degradation due to background work of SSD) or the lifespan of an SSD and can actively maintain its performance without the help of Magician. However, this algorithm does not operate when the power is off.

Q: Are there any functions of the new Magician that are required to keep read performance high?

A: The read performance has been improved by the revised firmware algorithm. If performance recovery is slow in instances where the SSD did not have enough run-time for the firmware algorithm to reach normal performance levels, or similarly, had been powered off for an extended amount of time, the performance can be recovered by using the Advanced Performance Optimization feature in Magician 4.6. This is a supplementary feature to maintain normal performance for a few exceptional circumstances.
Q: What is the upgrade process for those who did not previously upgrade using the performance restoration tool (meaning they are still on the original firmware)? Is it possible to skip directly to this new firmware and not use the performance restoration tool?

A: Users can upgrade to the new firmware through Magician 4.6, without using the performance restoration tool.
Q: Will there be a firmware update for the other Samsung TLC-based SSD models that have also demonstrated this read performance issue? If so, which models and how soon will that firmware be made available?

A: This issue had been reported for the 840 EVO SSD only.

**Edit** The new firmware will be available 'later this month'. we have a firmware that can do its own periodic refreshing of data, along with an 'Advanced Performance Optimization' that can be triggered from within Samsung SSD Magician. Those that had not updated their 840 EVO before this update can skip directly to the new firmware without the need to run the old 'Performance Restoration Tool'. We were a bit disappointed to see Samsung still ignoring their other TLC SSDs, on which many have reported seeing the same type of slow down (us included), but we've pushed that one about as hard as we could. For now, lets focus on the 840 EVO and see if this fix is really what it claims to be.

Video News

April 14, 2015 | 12:42 PM - Posted by Michael Scrip

Just so I'm clear... there has never been a problem like this with the 850 EVO, right?

I'm thinking about getting a couple 850 EVOs... but this whole situation kinda freaked me out!

April 14, 2015 | 12:43 PM - Posted by Anonymous (not verified)

The end of the reviews says "One final note - this issue was *only* on older TLC Samsung SSDs. Your 850 EVO is not affected (it has a completely different flash architecture), and neither is your 840 Pro or 850 Pro (those use MLC flash, not TLC)."

April 14, 2015 | 12:45 PM - Posted by Michael Scrip

Yeah I read that... just making sure there wasn't another kind of problem I should be worried about.


I feel better about buying 850 EVOs now :)

April 15, 2015 | 11:05 AM - Posted by Anonymous (not verified)

I've had a poor performance with the 850 EVO compared to an 840 EVO of similar capacity. In my own benchmark the 850 had slower reads than writes, but all together was slower than the 840 I already had. Note: The 850 Evo was recently purchased from Amazon.

April 14, 2015 | 12:57 PM - Posted by zalazin (not verified)

They keep dragging this out need to get off their butt now!!!

May 5, 2015 | 01:20 AM - Posted by Gerff (not verified)

Noone is dragging their butt, this is a very complicated process, and they must make sure the new firmware works in MILLIONS of completely different circumstances, and doesn't brick the drive when you upgrade it. People seem to think that this stuff can be done by simply waving a wand, or telling some I.S. guy to throw together a script real fast. If you are having this problem, and it is bugging you, or affecting you in some way, you can fix it with an XCopy to another drive, format it, then recopy to the SSD (clone it, then re-clone back), this will fix the issue until they get the new firmware released. The slowdown is due to the way an SSD works, they aren't holding bits magnetically, they are (as a metaphor) holding an electron prisoner in a cell (or the cell is empty). As time goes by, and the cell isn't checked for awhile, it becomes lethargic hiding in a dark corner, and a little harder to check its status (maybe even requiring some error correction by smacking the cell to see if it moves), and this is made harder by the fact that the cells are stacked on top of each other to allow more cells in the same surface area (three floors of cells, observed from the roof). The "fix" I gave earlier basically gives them some time outside to grab some sun and exorcize, and a bit more energy so they are more active and easily visible, making the count easier and faster. Of course this is a metaphor, but its a pretty good one without explaining EXACTLY how flash memory works. New firmware (instructions telling the hardware EXACTLY how to work, timings, cache handling, addressing (again, very different than conventional HDD, which is why you NEVER defrag an SSD), error correction (on supported drives), and how to communicate with the other PC components. Hardware fixes (and firmware) are not something you can do with a line or two of code in a few minutes, which means that a company taking the proper time, processes, testing, and steps to release proper firmware is not going to be able to release it "immediately", it takes TIME.

This also brings up another issue I have with the younger generations that grew up with tech and internet in their hands and heads from the time they were walking, they have no idea what patience is, and expect everything to be delivered instantly; most cannot even wait a few seconds for a webpage to load or a video to buffer, it is completely ridiculous. God forbid they have to wait days, or weeks for something. The american attention span has literally (do you know what that word really means?) decreased to 45 seconds, that is LESS THAN ONE MINUTE! Colleges now have their classes set up in two 1.5 hour sessions per week, rather than a single 3 hour session weekly because their students can't pay attention that long (this was a complete annoyance to me when I returned to refresh my education 2 years ago, you should NOT have to take 2 days a week per class; it should have been left at one 3 hour class weekly, if they can't pay attention, they learn to, or they fail). I returned to university because I wanted to make sure I held my advantage over the fresh graduates in my field, but after being there, seeing how the quality of the system has declined so drastically, I am no longer worried. I also feel very sorry for the professors, as they are forced to attempt to teach students who can not pay attention to anything longer than a 1 minute video clip, and its only that long if they are instantly interested, otherwise its only a couple of seconds before they drift off looking for something "entertaining". There are no longer full articles going into any real detail of ANYTHING in newspapers, magazines (what are left of those), webpages, etc., and I don't think books are even read anymore. This means the younger generation is "learning" tiny bits of things, but truly understand NOTHING. I have seen freshly graduated "programmers" who can't do anything past a basic script (Day ONE, and MAYBE two of a quality programming class USED to cover what seems to be their entire college education). There ARE still a few students who have the capabilities, attention span, and motivation to learn their field properly, and thankfully there are programs for them, but there are only a few in these programs, receiving the education that an average student would have received 15 years ago. For those who are still reading this, you have probably noticed what I am talking about, and agree entirely. Likely, you are older than 35 years old and are as frightened for the future of this country as I am, and also just as tired of the "kids" who think they know things, but in reality barely know a definition of what it is they think they know, because they can't pay attention to anything past the introduction (and they also gave up on reading this before the first paragraph ended, and some will comment with something like "TL-DR"). Yes, I know this is a bit "rant-ish", but the comment it is in response to shows exactly what I am talking about, no patience, and no understanding of the underlying tech they are commenting on, otherwise they would KNOW how ridiculous their comment is. I hope more people read this than I predict will, because that means there is still hope, and there are still people out there who have the IQ to truly research, and create new things, helping to advance our technology, and our species; If I am correct though, we may return to swinging from the trees and flinging poo in the near future.

GO BACK AND READ THE ENTIRE POST, REFLECT ON WHAT IT MEANS, AND SEE IF YOU CAN FIGURE OUT WHY I PUT THIS HERE!!! (Books are NOT for propping up table legs, and they don't put the important stuff in the intro)

July 18, 2015 | 02:12 PM - Posted by JustAMartin (not verified)

Samsung should do their homework and know what they are doing with those 19nm TLC cells before they released their product.

I had enough patience to read this. But I'm afraid that this won't help your country - I'm not from USA :D Our high schools and colleges have sessions every working day from 8:40 to 14:00 or even 15:00 and you have to sit there and listen. If you won't, then you can't pass exams. That simple.

April 14, 2015 | 01:18 PM - Posted by rick0502 (not verified)

so someone like me who runs 2 840's in raid 0 is SOL? yes i can turn off raid and run the firmware update (worked on the last firmware), but i cant run the advanced optimization.

" In trying to fix their stale data issue, Samsung now has a built-in tool that can trigger a background refresh procedure that accomplishes this same task, so in trying to fix one problem, they have actually added a useful feature to this product line."

wouldnt this cause excess writes to the drive?

April 14, 2015 | 01:22 PM - Posted by Anonymous (not verified)

I'm pretty sure Allyn said in the article that as long as you keep the SSDs powered, you won't need the Advanced optimization, and if you do unpower the drive, when you power it, the algorithm kicks in and goes to work. the advanced tool is only if you want the performance immediately after re-powering the SSD.

April 14, 2015 | 01:38 PM - Posted by Allyn Malventano

Firmware update procedure for RAID users is detailed mid-page here.

The firmware alone puts read performance where it should be. The Optimization is not necesary unless you want a bit more performance (the same can be accomplished on a RAID by running some other tools that rewrite old data). One such tool for this is DiskFresh.

Yes running these tools eat up write cycles (1-2 cycles for a full SSD), but that's a small percentage of the available cycles (1000 minimum, but TechReport got >3000 cycles on their endurance test).

April 15, 2015 | 07:02 PM - Posted by owcraftsman3610

So does that mean if you have a raid-0 pair of 840 evo the new firmware will refresh old data in the background if the system is left on? I assume you'd have to make sure the ssd's are set to always on in power management but correct me if I'm wrong.

April 14, 2015 | 01:33 PM - Posted by KrypteX (not verified)

How can Samsung say such nonsense: "the algorithm does not affect the lifespan of an SSD" ?

If the firmware itself rewrites old data periodically, then it will eat up extra P/E cycles, there's no way around that. An it WILL shorten the lifespan of the SSD. Maybe not by much, but it will. To me this simply looks like another lie from Samsung. I guess they're praying for the 840 EVO warranties to run out as fast as possible...

And saying that the regular 840s are not affected by this issue: that's the second lie from Samsung.

Seriously, they're just a bunch of liars.

April 14, 2015 | 01:40 PM - Posted by Allyn Malventano

The amount of cycles used is negligible. We are talking only an occasional operation that consumes 1-2 cycles. Even if it took place every 6 months on a full drive, it would consume at worst 2% of the lifespan. I agree with Samsung's statement on that point.

April 14, 2015 | 01:57 PM - Posted by KrypteX (not verified)

I still don't understand why did they have to add "does not affect the lifespan of an SSD" affirmation ?

Additionally, they are very well aware that the regular 840s are also having the same issues as the 840 EVOs. Samsung is very unprofessional with these kind of telegraphic statements "This issue had been reported for the 840 EVO SSD only". What are they, blind ? The thread on has been clearly showing that the regular 840s have the same problem (they're even worse, because they don't have the SLC caching).

They're are either blind or they simply disrespect their user base by acting as if they were unaware of the issue.

Again, Samsung proved that they consider us a bunch of ignorants, while they still cash in on the 840 EVO sales...

At this point, a sane person would just go with Crucial, Intel or Sandisk, instead of Samsung.
e.g. Crucial's MX200 is as fast as the EVO (if not faster), has SLC caching, no spooky "background refreshes" that eat up NAND cycles, no risk of losing data on power outage while performing the refresh, much higher endurance (it's MLC, not TLC) and it's cheaper. So why would anyone still trust they're "beloved" Samsung 840 EVO ?

April 14, 2015 | 02:12 PM - Posted by Allyn Malventano

I can't disagree on them not acknowledging other models as having the issue.

The MX200 uses Dynamic Write Acceleration, which is different, but not necessarily better, depending on how you use the SSD. When testing the M600 (same DWA feature), we ran into many cases where there was no SLC cache to use. I'm still evaluating our MX200 samples.

April 14, 2015 | 08:46 PM - Posted by fade2blac

I second your frustrations and thoughts regarding Samsung's apparent "let's just ignore it and maybe they'll go away" approach to regular 840 drives. I own a 500GB 840 and short of trying to RMA the thing, I don't know that Samsung has any plans to support their customers. Sure, I can occasionally run a program to rewrite stale data. This is a small inconvenience overall, but the principle of showing such indifference to customers is where I take exception.

As far as we know there is no reason to exclude the regular 840 drives from this "fix". This is purely hypothetical, but it could be that without the SLC cache, old data on regular 840's is subject to unacceptable risk during the 'magic fix' process. An important and reasonable distinction such as this would at least say Samsung has assessed the issue and regrettably does not see a way to safely improve the user experience of their product. At the very least, Samsung should acknowledge that these products have an issue and either communicate that they have plans to address the issue or state a clear reason for not doing anything.

As we have seen in other situations, it is very unlikely for a company to openly admit that a product is defective or fundamentally flawed. They just don't want to subject themselves to such liabilities when they can hide behind plausible deniability. If Samsung really can't do anything about it, then admission would open the floodgates to RMA's and class action suits. In the end, I just want a product that works pretty much as was advertised...even on day 1000.

Perhaps this is just a sign of the times where products are obsolete and discontinued before the warranty expires. However, this is not the first time I have been left with an unsupported/abandoned Samsung product. Therefore, I will choose not to consider more products from Samsung, because as you already point out, there are many other alternatives in what has become essentially a commodity market.

April 14, 2015 | 02:14 PM - Posted by collie

I'm afraid to ask, but is there any talk on fixing the non-evo 840? I was fixing the problem, or at least avoiding it, but since the last format my 840 started to slow within a month. Forgive me if the answer is already in the article, it's slow reading and I'm not finished, but super curious.

April 14, 2015 | 02:17 PM - Posted by Anonymous (not verified)

Allyn said "I will continue to push Samsung in recognizing that users of other 19nm planar TLC flash SSDs (i.e. the 840) also see this issue."

April 14, 2015 | 03:14 PM - Posted by Anonymous (not verified)

Things went smoothly, and we didn't even need to drop our Intel SATA controller out of RAID mode (though the SSDs we were updating were not in a RAID configuration and were seen as individual drives).

Why is your system set to RAID and not AHCI?

April 14, 2015 | 03:27 PM - Posted by Allyn Malventano

Individual (not part of a RAID) SSDs are handled as standard AHCI devices. Keeping the BIOS in RAID mode is common practice for those who might have a RAID connected in the future (no need to deal with possible blue screens or other complications from switching the mode after the OS has already been installed).

April 14, 2015 | 10:56 PM - Posted by Anonymous (not verified)

Thank you for your reply. Big fan btw.

April 14, 2015 | 04:53 PM - Posted by Anonymous (not verified)

I've got my controller in RAID mode...

I have a single 840 EVO as the system drive, but I also have huge two mechanical drives running in RAID1 for massive data storage.

April 14, 2015 | 03:16 PM - Posted by Anonymous (not verified)

^Oh and thanks for keeping us in the loop on this issue. Pcper is always going above and beyond to get the answers from the right people to correct issues that matter. You guys are the BEST!

April 14, 2015 | 03:21 PM - Posted by Anonymous (not verified)

Allyn, As you have hands on experience , do you know or can share if magican 4.6 officialy supports windows 10? .

Magican 4.5 did not and for example, it cant't obtain os check for enabling rapid node. I think, i also saw higher daily writes under 10 than 8.1

Maybe when oportiunity arises, you could whisper about issue to samsung people before they relese 4.6. I mean , many enthusiast already usingi it , windows 10 will be RC soon and next magican after 4.6 is probably half year away.

April 14, 2015 | 03:29 PM - Posted by Allyn Malventano

I haven't asked directly, but I'm sure that Samsung will update Magician to support Windows 10 once released. Fortunately, from our testing it sppears the firmware alone is 'good enough' at getting performance back to where it should be without the need for Magician (unless you absolutely want RAPID, but you really shouldn't be toying with that on a beta OS anyway).

April 14, 2015 | 03:30 PM - Posted by Anonymous (not verified)

Well since Windows 10 isn't officially released, 4.6 will not. Magician didn't support 8 until a month after it officially released. Same deal with 8.1.

April 14, 2015 | 04:15 PM - Posted by Anonymous (not verified)

TLC flash is not ever going to be trusted on 19nm or smaller plainer nodes, and hopefully whenever the stacked flash memory gets smaller in the planer(x and y) dimension, it can be made to be thicker in the z dimension to maintain the proper amount of long term state retention. I would rather pay a little more and get the MLC and SLC and the faster speeds inherent with their use, than even having any TLC cells. I am fine with spinning rust for long term storage, and having the SLC/MLC speed advantage, even if it means less SSD space for higher costs. Stacked flash is definitely the way of the future, for higher density with any memory cell types so hopefully the cost for SLC/MLC will go down also, and most laptop users are not even using above 1 TB in most uses, if even that.

I would like to see more Tiered storage management software make its way into the consumer/PC market, and some reviews of any Tiered storage management software that may be available to the consumer.

April 14, 2015 | 08:56 PM - Posted by HERETIC (not verified)

"TLC flash is not ever going to be trusted on 19nm or smaller plainer nodes"
At this point in time Sandisk don't appear to be having any
problems with their TLC flash...........................

April 14, 2015 | 11:42 PM - Posted by Anonymous (not verified)

Any idea when 'later this month' is going to be? There are still quite a few days left in this month.

April 15, 2015 | 05:40 AM - Posted by Lars (not verified)

>Finally Fixed

Surely this is misleading and speculative? We don't know if it's fixed, only time will tell. It could possibly be a cell leakage problem which any firmware- or Magician patch will simply obscure to the user; the disk itself is still borked.

I've got two 250GBs, I'll be emailing the consumer watchdog people and Samsung to see what's what.

April 22, 2015 | 02:42 PM - Posted by Allyn Malventano

Neither misleading nor speculative - confirmed with testing. It's not physically possible for firmware to 'obscure' an actual significant increase in read speed - when the SSD was not given enough time to read + rewrite the stale data at the slower speed prior to retesting. By *only* applying the patch and *not* refreshing old data, the read speed of very old data saw in instantaneous restoration in speed.

April 15, 2015 | 07:19 AM - Posted by razor512

Seems likey a band aid fix for the issue. If cell leakage is so bad that it needs to be refreshed in order to maintain performance after just a few weeks - months, then the drive will likely not meet data retention expectations.

Remember, they tried relaxing the threshold for when the ECC kicks in, and it still did not fix the issue.

TLC flash is getting read issues in weeks that MLC would likely not get for 10+ years of stagnation.

Also, while tech report got a lot of writes out of the flash cells, the true limit of the drive was about 100 TB of writes.
After that, it started to rapidly burn through reserve flash, and even got a few uncorrectabe errors, in addition to retention errors (after just a few weeks of being powered off).

When an SSD begins to constantly replace cells, then it is no longer reliable (This applies to TLC, MLC, and SLC).
Uncorrectable errors are worst than disk failures, as it means data can be corrupted silently. E.g., an old important document has flash cells degrade or drift to the point where it becomes unable to read back the correct info. Your automated backups eventually loops and overwrites old data (unless you have enough storage to never have to overwrite), and you eventually end up with all backups containing the corrupt file, but you will not know until the one day when you need to access that file again.

(How many people here individually open each and every individual file on their system in order to confirm that they can read properly before each and every backup?)

April 15, 2015 | 01:25 PM - Posted by fade2blac

Bit rot sucks and can also happen on mechanical HDDs and optical media as well as flash. The concern here, as you point out, is that the Samsung 19nm TLC NAND drives exhibit an unexpected/unacceptable likelihood to lose data over time. Essentially all storage should be viewed as ultimately unreliable, hence the 3,2,1 backup strategy.

This is why I use SnapRAID on my home server for long term storage. ZFS is nice with real time parity checking, but it is a bit extreme and cumbersome for the average user. SnapRAID strikes a nice balance between convenience, flexibility, and features that help protect your data. One of those features is a scrub process which reads and verifies files against drive parity as well as block-level checksums. This provides a means to periodically verify and restore the integrity of your files.

Statistically speaking RAID 5 should no longer be used for arrays with drives 4TB and larger since the very act of a RAID rebuild (a time when your data is particularly at risk) may introduce silent errors.

While we're at it, corruption of data in RAM is highly unlikely but still possible. Even ZFS and SnapRAID will happily write data that was silently corrupted while in system RAM. So to eliminate that gap, ECC RAM should also be considered for any machine used for long term storage and data management.

April 15, 2015 | 10:08 AM - Posted by Anonymous (not verified)

"I'm glad Samsung has stuck with it. Not many manufacturers would put so much effort into a two year old product, and the 840 EVO has proven to need a lot of work to get a difficult problem under control. Now to try to get them to enable the advanced optimization feature for all Samsung SSDs. I will continue to push Samsung in recognizing that users of other 19nm planar TLC flash SSDs (i.e. the 840) also see this issue. We will also continue to keep these samples stored with cold / stale data and retest occasionally."

Allyn, you can't be serious with this! They need to do a recall, and are probably required to do so by law.

If i unplug my drive and put it in the closet for a few months, what can i expect when i plug it back in? Data atrophy. This is a colossal defect, and the solution is a bad bad joke.

Shame on you.

April 15, 2015 | 10:46 PM - Posted by Allyn Malventano

You should read the article. The SSDs I tested were 'off' since the last update, and had slowed greatly, and simply patching the firmware alone (without running any restore function) brought read speeds back to the expected values.

April 15, 2015 | 10:49 AM - Posted by Suraj Deuja

What about us, I've installed an 840EVO on my macbook pro and lately i'm seeing the drive not responding as quick as it used to. Startup time is really turning out to be bad!!

April 15, 2015 | 11:26 AM - Posted by Allyn Malventano

The firmware update alone (which can be done on a macbook) will bring read speeds up considerably.

May 11, 2015 | 04:59 PM - Posted by Suraj Deuja

Thank you allyn for you time.

April 15, 2015 | 01:48 PM - Posted by Anonymous (not verified)

Sorry guys but I'm a noob...

I just bought a brand new computer in November, with a 840 EVO SSD.

I have win 7 installed on it, then your usual stuff: games, mp3s, videos.

Here is my question: How do I update the firmware ?

thanks in advance

April 15, 2015 | 02:28 PM - Posted by Anonymous (not verified)

the Fw update is non destructive. Magician will prompt you to update it. You just have to press ok.

April 15, 2015 | 10:47 PM - Posted by Allyn Malventano

What he said, but you should still backup just in case.

April 15, 2015 | 04:54 PM - Posted by mxthunder

This is not an acceptable fix. I will never buy a Samsung product again. Its hard to understand how a company of this caliber can stoop to such low levels.

April 15, 2015 | 10:49 PM - Posted by Allyn Malventano

I don't see how this fix could be not acceptable. It brings read speeds back where they should be, and if advanced optimization is performed, it brings them even faster than any typical SSD (that had slowed over time due to fragmentation).

April 15, 2015 | 06:38 PM - Posted by Anonymous (not verified)

Thanks a lot for the article. Keeping my fingers crossed that this is the permanent fix.

April 16, 2015 | 06:38 AM - Posted by tazdevil (not verified)

Sorry if I missed it...
What % do you lose with the new software if you shut the computer down multiple times in a laptop?
ie.. Work / Library /Home {Repeat}

April 16, 2015 | 11:08 AM - Posted by Anonymous (not verified)

Noob here,i have the Evo 850 Pro on Windows 8.1 and from almost day 1 have had problems with Rapid mode,i installed magician 4.5 and did all the optimizations/overprovisioning and enabled Rapid mode.However i kept experiencing little but almost weekly problems with Windows 8.1 so imaged back to version 8.0 which was the OEM version,but now i cannot install Magician 4.5,i just get an error box which states:"Reboot is pending after last RAPID mode operation.Reboot the system and try again-ok".Now Samsung have said to me- "There was a problem with the Magician which could have been solved remotely: we could have access your PC and change something in the Magician and the issue was solved, but at the moment we cannot use this solution anymore".Will this update sort out my problem do you think,or should i consider the RMA route?
Thanks for reading

April 16, 2015 | 12:03 PM - Posted by Pk (not verified)

I think that this periodic rewriting of old files should actually INCREASE life expectancy in real-world situations.
A lot of files are written once and seldom (if ever) change. The blocks used by these files do not participate in wear levelling, so the remaining blocks will have to absorb all writes to the drive, exhausting their P/E cycles in a shorter time. As a consequence, you will end with a drive in which a lot of blocks have been erased only a few times when the rest of them are worn out.
By periodically rewriting old files, those blocks are freed, and there will be more blocks to distribute P/E cycles.

April 17, 2015 | 01:33 AM - Posted by damage v2 (not verified)

Hello i manually updated to magician 4.6 still don't see the firmware.When is it coming?

April 17, 2015 | 02:29 AM - Posted by damage v2 (not verified)

Just gonna add my drives are defiantly slowing down again.I have 120gb evo.AS SSD benchmarks are all fine even benchmark inside samsung magician is fine.But HDtune,hd tach all tell a different story.Is it safe to run the performance restore utility again?I ran it first when i installed windows.I see there is a registry entry of it.If i delete it, i guess i can run it again.

April 17, 2015 | 04:47 AM - Posted by Sven (not verified)

Damn. I have a 840EVO in my iMac. The last FW update on the DOS-disc were impossible since it could not be booted. Had to disassemble the machine and put the SSD into the Macbook, where it was able to boot off the ISO and update. The drive in this Macbook is also an 840EVO. I am back down to 10MB/s on the iMac yet - tested with old movies residing in the iTunes folder. Do i have to repeat this effin procedure again over and over? They should recall those suckers and exchange with 840 PRO or newer models. I own three 840EVOS in total, and paid more than 1.200 EUROs in total for them. This is not acceptable. At least they should create some native FW-Updater for Linux and Mac users. I'm pissed.

April 17, 2015 | 11:30 AM - Posted by Anonymous (not verified)

They can't since Apple doesn't allow 3rd party SSD companies access to their AHCI driver.

April 17, 2015 | 06:21 AM - Posted by Anonymous (not verified)

does anyone know where i can dl this firmware and updated software?

April 17, 2015 | 10:11 AM - Posted by Wijkert

Did you read the article?

"**Edit** The new firmware will be available 'later this month'."

April 25, 2015 | 01:57 PM - Posted by Eugene (not verified)

Is it "later this month" yet?

April 17, 2015 | 10:51 AM - Posted by AndyRN

I apologize I feel like the answer is there but I'm not sure. I know this whole problem has been focused on the evo drive and they state it's only the evo drive; however, there where reports jt affected the vanilla 840 as well, which I have. Can I apply this update to the vanilla 840? Thanks for working on this issue.

April 17, 2015 | 03:36 PM - Posted by amadsilentthirst

Allyn I hope you asked Samsung, if they could release this "software" for all their SSD's.

I'd love a button I could press, to get a fresh drive, even though I've got a 840pro, it still would benefit from rewriting all.

(really don't feel like cloning it back and forth when there is a better way.)

April 18, 2015 | 05:42 AM - Posted by Anonymous (not verified)

Please advise, have 4 of these drives in linux machines with ext4:
Last time to run a fix you had to have some "known" file system recognizable by update software, I suppose ntfs or fat.
This time, as just fw update should be enough to deploy the fix, will this operation be file system agnostic?

April 18, 2015 | 10:41 AM - Posted by Anonymous Bogus (not verified)

Last time to run a fix you had to have some "known" file system recognizable by update software, I suppose ntfs or fat.
This time, as just fw update should be enough to deploy the fix, will this operation be file system agnostic?

Also Linux on ext4 here, with the 1TB mSATA 840 Evo. It is not true that the last update/"fix" had assumptions about the file system. I made the update via a free-DOS thumb drive and that performance restoration tool worked flawlessly. It took more than an hour, as far as I remember.

April 19, 2015 | 03:47 AM - Posted by HERETIC (not verified)

Hi Allyn,Please keep pressure on Samsung-RE Non EVO 840.
At least give us Advanced Optimization in Magician-Would
be a compromise we could probably accept.............
Bit of a advanced Defrag for SSD's........
And added benefit of smaller metadata table-sweet.....

Have to have a giggle-The No of times I've read-

April 20, 2015 | 12:47 PM - Posted by Anonymous (not verified)

Must be something wrong with this "fix" or they would have released it already.

April 21, 2015 | 11:05 AM - Posted by Anonymous (not verified)

So, they let the press see this to get positive reviews, but then don't release it. Does something smell fishy to anyone else?
Did they specify the conditions of these test?

April 21, 2015 | 04:02 PM - Posted by Anonymous (not verified)

When is it firmware coming out?

April 23, 2015 | 04:40 AM - Posted by Anonymous (not verified)

New Firmware is out

April 23, 2015 | 09:40 AM - Posted by NotSoFast (not verified)

New /Magician/ software is out for Windows, and perhaps that in turn downloads firmware.

There is not yet any new /firmware/ available for Mac or Linux users.

April 23, 2015 | 09:43 AM - Posted by NotSoFast (not verified)

And even for Magician, check out this bizarre message from Samsung:

We apologize for your inconvenience
Please try again within 24 hours
From April 23-April 27, 2015, there is a daily limit on the number of Magician 4.6 downloads.
Unfortunately, the download limit for the day has been reached, please try again within 24 hours.
We apologize for any inconvenience this might have caused you. Thank you.

April 23, 2015 | 09:56 AM - Posted by NotSoFast (not verified)

From the 4.6 Installation Guide: "Advanced Performance Optimization of Magician 4.6 is only supported in Samsung SSD 840 EVO 2.5” model."

So 840 EVO mSATA users are SOL, assuming its NAND is the same as or substantially similar to the 840 EVO 2.5", which you would think based on:

* * *

mSATA version was released later than the 2.5" version. If mSATA versions are actually immune to the problem, perhaps Samsung noticed and stopped a manufacturing problem or only sourced the NAND for mSATA version from a plant that had no such problem?

April 23, 2015 | 05:03 PM - Posted by Anonymous (not verified)

mSATA is not immune.

I posted a comment in the previous article including screenshots of a before and after state of the 1 TB mSATA SSD.

April 23, 2015 | 11:16 AM - Posted by Anonymous (not verified)

"From the 4.6 Installation Guide: "Advanced Performance Optimization of Magician 4.6 is only supported in Samsung SSD 840 EVO 2.5” model."

I have 840 EVO 2.5 model and Magician 4.6 does not have the
Advanced Performance Optimization option. Maybe the option
will be displayed when new firmware is avalable - so far
Magician 4.6 does not find any new FW version.
Samsung's kookin somthin :/

April 23, 2015 | 11:25 AM - Posted by NotSoFast (not verified)

I surmise they want the firmware rolled out slowly so that if there are any problems the damage is limited. That's reasonable. I will wait a week. It's probably in your and my best interest do move cautiously. But next week I sure hope the DOS updater is available so I can fix the drives in my Mac.

April 23, 2015 | 12:17 PM - Posted by Stiff (not verified)

What are u talking about? that users are beta testers? they releasing an untested firmware lol cmon Sammy...

April 23, 2015 | 01:37 PM - Posted by NotSoFast (not verified)

I'm not making excuses for Samsung. I own thousands of dollars worth of 840 EVO drives and I am /not/ happy.

However, the distinction between beta and released code is just whenever someone decides enough testing has been done. Testing still goes on after GA, it's just more widely tested by actual users... For example, I typically wait a week before applying iOS updates -- sometimes nasty bugs don't appear until a day or two after release. Another example: Samsung recently bricked some 850 PRO drives with a bad firmware udpate, so they're probably gun shy now.

April 24, 2015 | 01:06 AM - Posted by damage v2 (not verified)

I just updated to the new firmware.Speed back like it was day 1.Booting was lightning fast.ALL benchmarks again show day 1 result.Now lets see if it last.

April 24, 2015 | 05:20 AM - Posted by damage v2 (not verified)


April 24, 2015 | 08:57 AM - Posted by Sparky

I got good results:
(can you tell which data has been there since December? I installed the last 'fix' when it was released)

Just the firmware update 4/23/2014:

After optimization:

This is in my primary desktop that is on/used for 8-12 hours a day. I game 2-3 nights a week. Loading times have been suffering lately in 'older' games. Felt like they were back on a mechanical drive.

April 24, 2015 | 09:05 AM - Posted by Sparky

Oh yeah, I got a generic response from Samsung over a month ago along the lines of "is the computer on" and to apply the last 'fix'...

I'm glad enough people got through and the issue is now hopefully fixed.

April 28, 2015 | 04:41 PM - Posted by ablatt

Optimization can only be done in Windows and on an NTFS drive. If it helps this much, why is Samsung not providing a Linux/Mac version as they did with the restoration tool?

April 26, 2015 | 10:02 PM - Posted by Anonymous (not verified)

Anyone else getting lower average sequential read speeds after the update? Initially my speeds were maxed out at 480MB/Sec. Now its consistently around 430MB/sec.

April 27, 2015 | 05:39 AM - Posted by Marcus93 (not verified)

The new firmware completely fuc*s up the trim functionality in Linux. It's impossible to execute the "fstrim /" command and formatting the drive in ext4 causes alerts for the presence of bad sectors.

April 27, 2015 | 12:47 PM - Posted by Anonymous (not verified)

You're kidding, right? I too I'm on linux.
Ubuntu does a "auto" trim (scheduled with fstrim), do you think this is also affected?
By the way I can't see the new iso firmware for linux.

April 27, 2015 | 02:56 PM - Posted by Marcus93 (not verified)

Sadly I'm not kidding, I really don't know what to do, I'm powerless. The first reports of other people are appearing through the net ( Yes even that is affected because the command is the same. You probably have not experienced any issues yet because it's a weekly job. Try to execute "sudo fstrim /" and see. Can the maker of this article point out this new problem? Otherwise I think we are really in the s**t

May 11, 2015 | 12:59 PM - Posted by Allyn Malventano

The older firmwares for the 840 EVO did not report that they supported queued TRIM. The new firmware does, perhaps by accident as the support does not appear complete. It will likely be added to the queued TRIM blacklist in Linux (like a few other SSDs that fall into the same boat).

May 14, 2015 | 09:01 AM - Posted by Andrea (not verified)

Do not do any fstrim or similar...

Boot appending "libata.force=noncq" to the kernel command line and you are OK, then if you want to enable ncq you should rebuild a kernel adding a little patch to drivers/ata/libata-core.c: Just add ATA_HORKAGE_ZERO_AFTER_TRIM form "Samsung SSD 840 EVO*" in struct ata_blacklist_entry ata_device_blacklist.

If you are not so confortable with kernel build I think you can safely use "libata.force=noncq" until the next firmware update that hopefully will resolve the BUG.

April 28, 2015 | 05:53 AM - Posted by ChrisC (not verified)

So glad I made sure I stuck with MLC, I advised people on the 840 launch to buy 830s and avoid TLC.

I own 2 830s and an 850 pro.

April 29, 2015 | 06:43 PM - Posted by Wrend

The 850 EVO though... Have a 1TB one in my laptop. Nice "bit of kit," that (4+½ seconds full boot times in 8.1, etc). If I remember correctly, it even outperforms the PRO in some scenarios due to the SLC cache.

I do have a 1TB 840 EVO in my main home PC and a 500GB one in my wife's laptop. At least now it looks like they're going to continue to be solid performers. Thank goodness I've never had reliability issues with them, or I would have jumped ship a while ago.

May 1, 2015 | 07:36 PM - Posted by DaveSimonH

Forgot to run the "SSDReadSpeedTester" before I updated to Magician 4.6 and new firmware, but ran it before and after running Advanced Performance Optimization. 250GB drive (used space 79.9GB of 232GB).


May 2, 2015 | 04:51 AM - Posted by gerrd (not verified)

The samsung firmware for my EVO 840 SSD EXT0DB6Q did NOT fix my issues, its even slower then before.

installed tool and firmware
rebooted twice
uninstalled antivirus
cleanup the drive so only windows 8.1 is there
Used the advanced optimisation option in the magician 4.6 tool.

Afther advanced optimisation:
Random Read in iops is 37000
Random Write in iops is 16000

in the beginning its was:
Random Read in iops is 93400
Random Write in iops is 85940

May 3, 2015 | 10:09 PM - Posted by Anonymous (not verified)

Hmmmm, just started using 840 evo external hdd. Is there a way to apply the fix to external usb 3.0 enclosure? Don't have a computer to swap out internal drives.

May 4, 2015 | 10:17 AM - Posted by Branthog

May 4th and Samsung Magician still claims the installed version (4.5) is the latest version.

May 6, 2015 | 01:55 AM - Posted by Craig (not verified)

I just tried using the bootable ISO update (EXT0DB6Q) on my mSATA 840EVO, and it said "no supported SSD's detected for firmware update".The Magician software, as has already been stated, says that EXT42B6Q is the latest firmware. Does this mean that the mSATA drives are not affected by this slowdown anymore?

May 6, 2015 | 03:55 PM - Posted by Josep (not verified)

The same for me. Linux environment.

Added to that, had difficulties to prepare the bootable ISO (in an USB device), but finally could preparing an isolinux.

May 8, 2015 | 02:04 PM - Posted by Pk (not verified)

I have a mSATA 840 EVO too, and I can confirm that these drives have the same problem as 2.5" EVOs . Samsung has not released any new FW for this drive so far. I am using diskfresh to periodically rewrite sectors in my drive.

May 10, 2015 | 06:56 PM - Posted by John H (not verified)

I just updated my 750GB 840 EVO with firmware EXT0DB6Q on my Macbook pro. I'm not sure what happened with this firmware but my Write speed is at 55 MB/s and Read speed is 511 MB/s. How do I optimize my write speed? I'm using about 320 GB.

July 24, 2015 | 01:24 PM - Posted by Anonymous (not verified)

I was getting min 4.4 MB/s, max 306 MB/s, average of 77.9 MB/s.

I updated the firmware with Magician 4.6 as instructed by Samsung. I now can't run HD Tune Pro. I get read error. I am also now losing files intermittently. So disappointed in Samsung.

August 31, 2015 | 10:24 PM - Posted by Gary C. (not verified)

New Samsung Magician software :

"Magician version 4.7 features a number of improvements over version 4.6:
- New model support: 850 PRO 2TB, 850 EVO 2TB
- Advanced Performance Optimization support for 840 EVO mSATA
- New firmware is required to use Advanced Performance Optimization

- Minor bug fixes"

I don't see the "new firmware" on their site for the mSATA EVO, but the new 4.7 Magician may find it for the mSATA users.

April 30, 2016 | 10:39 AM - Posted by Karl (not verified)

I've just read and re read the info on the pages and all the comments and it was informative and interesting so thanks

I am new to SSD's and have a EVO840
in windows 7 it still gives the option to defrag, in windows 10 (2x boot setup) it will not let you defrag

so the new firmware refreshing the data on the SSD
could we just do the same thing by doing a defrag of the SSD ?
or even doing a true image backup and restore writing the files back to the SSD from a HDD backup?

April 30, 2016 | 10:46 AM - Posted by Karl (not verified)

Also what about the over provisioning space? is this refreshed or is it best to turn of OP while the refresh goes on

also OP on or off does it work (by saving about 20% and keeping the SSD fast)

July 29, 2018 | 06:49 AM - Posted by xftroxgpx (not verified)

During this so called refresh that the firmware does transparently(which happens at least 1 times per day, lasting hours) and cannot be stopped by anything other than a Windows shutdown (ie. power off, because reboot won't do it): got 2 meg per second random write speed (eg. CDM's 4KiB Q1T1)
Crystal Disk Mark:
Magician (4300iops, takes 5min36sec to run the test):

Normal, no refresh happening: 26 meg per second -
Magician (27241iops, takes 1min6sec to run the test - aka normal speeds):

There doesn't seem to be any way to tell the SSD to not run the refresh. I don't understand why Samsung thought this was a good idea: running the refresh at least once a day (assuming I shutdown my PC every day, ofc) seems like such a terrible idea, not only for writes performance while refresh is going on, but more importantly for the SSD lifetime!! I expect this SSD will last no more than 3 years due to this EXT0DB6Q firmware doing such refreshes, and there's no way to downgrade to a previous firmware version!

Needless to say I'm avoiding all Samsung stuffs forever from now on!

July 29, 2018 | 07:52 AM - Posted by xftroxgpx (not verified)

let me correct that for you:

Q: The new firmware appears to restore read performance without the need for Magician. How was this accomplished?

A: Samsung revised the firmware algorithm to maintain consistency in performance for old data under exceptional circumstances. Therefore, read performance was restored without the need for Magician. This algorithm is based on a periodic refresh feature that can maintain the read performance of this older data. The algorithm does affect normal user scenarios (i.e. occasional PC performance degradation due to background work of SSD) and the lifespan of the SSD, but can otherwise maintain its performance without the help of Magician. However, this algorithm does not operate when the power is off.

September 22, 2018 | 08:54 AM - Posted by xftroxgpx (not verified)

In the comment above "July 29, 2018 | 06:49 AM - Posted by xftroxgpx (not verified)" I'm sorry to say that I WAS WRONG about the 2MB/sec low speed being caused by Samsung SSD. It was instead a quirk in my Lenovo Ideapad Z575 laptop whereby after a Windows 7 Restart, while the SSD is connected on the optical disk drive bay (via a caddy), it would start exhibiting that 2MB/sec low random write speed! I don't know why still! But I'm sure now that it's because of the laptop/BIOS, and NOT because of Samsung SSD or its new firmware.

When I place a Kingston SSD on the ESATA port, keep the Samsung SSD on the ODD bay, then it's ONLY the Kingston SSD that experienced the 2MB/sec low random write speed after the first Linux reboot. Samsung SSD's write speed remains as high as usual (like 36MB/sec) regardless of how many restarts happen.

This is how I know it's not Samsung SSD's fault, it's Lenovo Ideapad Z575's fault or something.

Therefore there's no way to know when the refreshing happens and I've not seen any performance slowdown, even though the lifespan of the cells may still decrease with each refresh(I don't know that, but I'm assuming that there's no way to refresh the cells without decreasing their lifetime - I may be wrong).

So ignore my previous comment too, this one: "July 29, 2018 | 07:52 AM - Posted by xftroxgpx (not verified)"

Post new comment

The content of this field is kept private and will not be shown publicly.
  • Lines and paragraphs break automatically.
  • Allowed HTML tags: <a> <em> <strong> <cite> <code> <ul> <ol> <li> <dl> <dt> <dd> <blockquote><p><br>
  • Web page addresses and e-mail addresses turn into links automatically.

More information about formatting options

This question is for testing whether you are a human visitor and to prevent automated spam submissions.