Subject: Editorial, Storage
Manufacturer: PC Perspecitve
Tagged: tlc, Samsung, bug, 840 evo, 840

Investigating the issue

Over the past week or two, there have been growing rumblings from owners of Samsung 840 and 840 EVO SSDs. A few reports scattered across internet forums gradually snowballed into lengthy threads as more and more people took a longer look at their own TLC-based Samsung SSD's performance. I've spent the past week following these threads, and the past few days evaluating this issue on the 840 and 840 EVO samples we have here at PC Perspective. This post is meant to inform you of our current 'best guess' as to just what is happening with these drives, and just what you should do about it.

The issue at hand is an apparent slow down in the reading of 'stale' data on TLC-based Samsung SSDs. Allow me to demonstrate:

840 EVO 512 test hdtach-2-.png

You might have seen what looks like similar issues before, but after much research and testing, I can say with some confidence that this is a completely different and unique issue. The old X25-M bug was the result of random writes to the drive over time, but the above result is from a drive that only ever saw a single large file write to a clean drive. The above drive was the very same 500GB 840 EVO sample used in our prior review. It did just fine in that review, and at afterwards I needed a quick temporary place to put a HDD image file and just happened to grab that EVO. The file was written to the drive in December of 2013, and if it wasn't already apparent from the above HDTach pass, it was 442GB in size. This brings on some questions:

  • If random writes (i.e. flash fragmentation) are not causing the slow down, then what is?
  • How long does it take for this slow down to manifest after a file is written?

Read on for the full scoop!

Upgrade your selfies to the next level with these new products announced at IDF

Subject: General Tech | September 15, 2014 - 12:00 PM |
Tagged: idf 2014, sony, Panasonic, Samsung, cameras

At IDF there were a few new cameras on display which caught The Register's attention in amongst the smart appliances and other gadgets.  For the highest quality selfies try the Panasonic HX-500 4K activity cam which is good at depths of up to 3 metres for up to 30 minutes.  Perhaps you would prefer to pair your Galaxy Note 4 with the Samsung Galaxy VR headset to give you an Occulus like look at the world; a 96-degree view which is intended to look like a 175-inch screen seen from 2 metres away.   Samsung users could also pick up the Olloclip for Android, giving you fisheye and wide angle lenses for your Galaxy S4 or S5.  There is more in the article, check them all out here.

samsung_galaxy_vr_1.jpg

"Image is everything - or so it has been said, and if the gadgets at the recent IFA techfest in Berlin are anything to go by then manufacturers certainly seem to think we’re image obsessed. With selfies being a global compulsion, perhaps they know us better than we know ourselves."

Here is some more Tech News from around the web:

Tech Talk

Source: The Register

Podcast #312 - Thecus N2560 NAS, ASUS STRIX GTX 780, Flash Media Summit News and more

Subject: General Tech | August 7, 2014 - 10:37 AM |
Tagged: podcast, video, Thecus, n2560, asus, strix, strix 780, flash media summit, Samsung, tlc, vnand, Marvell, gtx 880, x99s sli plus

PC Perspective Podcast #312 - 08/07/2014

Join us this week as we discuss the Thecus N2560 NAS, ASUS STRIX GTX 780, Flash Media Summit News and more!

You can subscribe to us through iTunes and you can still access it directly through the RSS page HERE.

The URL for the podcast is: http://pcper.com/podcast - Share with your friends!

  • iTunes - Subscribe to the podcast directly through the iTunes Store
  • RSS - Subscribe through your regular RSS reader
  • MP3 - Direct download link to the MP3 file

Hosts: Jeremy Hellstrom, Josh Walrath, Scott Michaud, and Morry Tietelman

Program length: 1:00:33
 

Subscribe to the PC Perspective YouTube Channel for more videos, reviews and podcasts!!

 

FMS 2014: Samsung announces 3D TLC VNAND, Storage Intelligence initiative

Subject: Storage, Shows and Expos | August 5, 2014 - 01:19 PM |
Tagged: FMS, vnand, tlc, ssd, Samsung, FMS 2014, Flash Memory Summit

Just minutes ago at the Flash Memory Summit, Samsung announced the production of 32-layer TLC VNAND:

DSC03974.JPG

This is the key to production of a soon-to-be-released 850 EVO, which should bring the excellent performance of the 850 Pro, with the reduced cost benefit we saw with the previous generation 840 EVO. Here's what the progression to 3D VNAND looks like:

progression slide.png

3D TLC VNAND will look identical to the right most image in the above slide, but the difference will be that the charge stored has more variability. Given that Samsung's VNAND tech has more volume to store electrons when compared to competing 2D planar flash technology, it's a safe bet that this new TLC will come with higher endurance ratings than those other technologies. There is much more information on Samsung's VNAND technology on page 1 of our 850 Pro review. Be sure to check that out if you haven't already!

Another announcement made was more of an initiative, but a very interesting one at that. SSDs are generally dumb when it comes to coordinating with the host - in that there is virtually no coordination. An SSD has no idea which pieces of files were meant to be grouped together, etc (top half of this slide):

DSC04016.JPG

Stuff comes into the SSD and it puts it where it can based on its best guess as to how it should optimize those writes. What you'd want to have, ideally, is a more intelligent method of coordination between the host system and the SSD (more like the bottom half of the above slide). Samsung has been dabbling in the possibilities here and has seen some demonstrable gains to be made. In a system where they made the host software aware of the SSD flash space, and vice versa, they were able to significantly reduce write latency during high IOPS activity.

DSC04014.JPG

The key is that if the host / host software has more control over where and how data is stored on the SSD, the end result is a much more optimized write pattern, which ultimately boosts overall throughput and IOPS. We are still in the experimentation stage on Storage Intelligence, with more to follow as standards are developed and the industry pushes forward.

It might be a while before we see Storage Intelligence go mainstream, but I'm definitely eager to see 3D TLC VNAND hit the market, and now we know it's coming! More to follow in the coming days as we continue our live coverage of the Flash Memory Summit!

Samsung's new flash stands above the competition

Subject: Storage | July 7, 2014 - 12:58 PM |
Tagged: vertical, V-NAND, ssd, sata, Samsung, 850 PRO, 3d

As you saw in Al's review, the Samsung 850 drive is more than just a small bump in model number and performance, it is the stellar introduction to 3D NAND.  The Tech Report is likely having nightmares from the drives reported longevity which is expected to be up to 10 times the cycles of current drives and means an update to their long running endurance test could see them testing into the 2020's.  While they haven't yet added the 850 to that particular test they did post a review which starts out with a comprehensive look at the history of Flash technology and why 3D NAND is faster and more resilient than previous types; read on to get  a better understanding of the fastest consumer SATA drive on the market.

nand2.jpg

"Most flash memory is limited to a single layer, but the V-NAND chips in Samsung's new 850 Pro SSD stack 32 layers on top of each other. This is next-level stuff, literally, and it's supposed to make the 850 Pro the fastest SATA drive around. We investigate."

Here are some more Storage reviews from around the web:

Storage

Podcast #307 - EVGA Torq X10 Mouse, Samsung 850 Pro, OCZ RevoDrive 350 and more!

Subject: General Tech | July 3, 2014 - 12:17 PM |
Tagged: podcast, video, evga, TORQ X10, Samsung, 850 PRO, ocz, RevoDrive 350, Silverstone, Nightjar, knights landing, Xeon Phi

PC Perspective Podcast #307 - 07/03/2014

Join us this week as we discuss the EVGA Torq X10 Mouse, Samsung 850 Pro, OCZ RevoDrive 350 and more!

You can subscribe to us through iTunes and you can still access it directly through the RSS page HERE.

The URL for the podcast is: http://pcper.com/podcast - Share with your friends!

  • iTunes - Subscribe to the podcast directly through the iTunes Store
  • RSS - Subscribe through your regular RSS reader
  • MP3 - Direct download link to the MP3 file

Hosts: Ryan Shrout, Josh Walrath, Jeremy Hellstrom, and Morry Tietelman

Program length: 1:19:27

Subscribe to the PC Perspective YouTube Channel for more videos, reviews and podcasts!!

 

Tidbits from the 2014 Samsung SSD Summit

Subject: Storage | July 1, 2014 - 06:53 PM |
Tagged: V-NAND, Summit, ssd, Samsung, 2014

Here are some goodies from yesterdays briefings at the 2014 Samsung SSD Summit:

Slides from the 3D V-NAND discussion. These provide some additional visuals for what I explained in the intro to the 850 PRO series SSD review:

DSC01813.JPG

DSC01829.JPG

DSC01832.JPG

DSC01842.JPG

DSC01843.JPG

DSC01845.JPG

DSC01866.JPG

Next we got into current launching lineups. First the 850 PRO that launched today:

DSC01923.JPG

Samsung also launched an 845DC PRO, which uses the previous generation 24-layer V-NAND:

DSC01968.JPG

DSC01959.JPG

DSC01963.JPG

Finally, as we walked out of the conference, we saw a 32-layer V-NAND wafer on display:

IMG_6814.JPG

Taking die pictures is tricky...

DSC01633_DxO-.jpg

...but persistence is rewarded:

DSC01731_DxO--.jpg

More to follow!

Subject: Storage
Manufacturer: Samsung

Introduction

Samsung has certainly been pushing the envelope in the SSD field. For the past two years straight, they have launched class leading storage products, frequently showing outside-the-box thinking. Their 840 PRO series was an impressive MLC performer to say the least, but even more impressive was the 840 EVO, which combined cost-efficient TLC flash with a super-fast SLC cache. The generous SLC area, present on each die and distributed amongst all flash chips within the drive, enabled the EVO to maintain PRO-level performance for the majority of typical consumer (and even power user) usage scenarios. The main win for the EVO was the fact that it could be produced at a much lower cost, and since its release, we've seen the EVO spearheading the push to lower cost SSDs.

All of these innovations might make you wonder what could possibly be next. Today I have that answer:

DSC01485.JPG

If you're going "Hey, they just changed the label from 840 to 850!", well, think again. This SSD might have the same MEX controller as its predecessor, but Samsung has done some significant overhauling of the flash memory itself. Allow me to demonstrate.

Here's standard (2D) flash memory, where the charge is stored on a horizontal plane:

Samsung_27nm_NAND_cross-section_01-.jpg

..and now for 3D:

3D-NAND--.jpg

The charges (bits) are not stored at the top layer. They are stored within all of those smaller, thinner layers below it. You're still looking at a 2D plane (your display), so here's a better view:

vnand crop--.png

Read on as we dive even deeper into this awesome new 3D flash technology!

Where in the world is Allyn Malventano?

Subject: Storage | June 30, 2014 - 01:01 PM |
Tagged: Samsung, ssd, Summit, Global

Chicago?

IMG_6649.JPG

Tokyo?

IMG_6738.JPG

Seeking asylum at some random baggage claim area?

IMG_6756.JPG

Guess again. Here's a hint:

IMG_6784.JPG

More to follow, boys and girls. Stay tuned!

Some good news on competition for a change; SSDs may be getting cheaper

Subject: General Tech | June 23, 2014 - 10:38 AM |
Tagged: ssd, kingston, Samsung, Intel, sandisk, rumour

If the information provided to DigiTimes is correct we may be in for a price war between SSD manufacturers.  We have seen price drops in flash memory, especially with the advent of TLC and asynchronous flash which have been heartily approved by most enthusiasts.  However there is a chance that in the coming months competition will start driving prices of SSDs down but may have the opposite impact on other products.  Micron is planning on reducing the amount of memory it sells to other companies in order to ramp up its stock of SSDs and SanDisk has jumped into the market with both feet.  You can also expect to see all the major manufacturers start putting out more M.2 drives as adoption of Intel's Z97 board grows.

pricesfalling.jpg

"The SSD industry is heading for fierce price competition as major suppliers, including Micron Technology, Intel, Kingston Technology, SanDisk and Samsung Electronics, are gearing up efforts to outperform others, according to industry sources."

Here is some more Tech News from around the web:

Tech Talk

Source: DigiTimes