SanDisk's Extreme II, the neopolitan SSD

Subject: Storage | July 15, 2013 - 04:05 PM |
Tagged: sandisk, Extreme II series, ssd, mlc, slc

SanDisk has done something interesting with their new Extreme II SSD series, they have used both SLC and MLC flash in the drive to attempt to give users the best of both worlds.  The drive still has a DDR cache sitting between the flash storage and the controller, but there is an nCache between the MLC flash and the DDR comprised of ~1GB of SLC flash.  The idea is that the SLC can quickly accumulate a number of small writes into a larger single write block which can then be passed to the MLC flash for storage.  Don't think of it as a traditional cache in which entire programs are stored for quick access but more as a write buffer which fills up and then passes its self to the long term storage media once it is full.  The Tech Report put this drive through their tests and found it to be a great all around performer, not the fastest nor the best value but very good in almost any usage scenario.

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"With MLC main storage and an SLC flash cache, the SanDisk Extreme II is unlike any other SSD we've encountered. We explore the drive's unique design and see whether it can keep up with the fastest SSDs on the market."

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SanDisk pairs Marvell and MLC in their new Extreme II series

Subject: Storage | June 7, 2013 - 06:38 PM |
Tagged: sandisk, Extreme II series, marvell 9187, 19nm, mlc

SanDisk claims their Extreme II can run at 550/510 MB/s sequential read/write, and 95,000/78,000 for random read/write IOPS, a claim which [H]ard|OCP just put to the test.  The two major changes to this drive that will contribute to the difference in speed are the switch from a Sandforce controller to the Marvell 9187 controller and the MLC flash which is 19nm in this drive.  Testing shows that the drive does live up to expectations though they did point out the lack of encryption as a weakness.  Prices for the drives are around the magic $1/GB mark, making this drive a solid contender in a very populous market.

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"SanDisk releases its Extreme II series SSD, which features the Marvell 9187 controller in concert with 19nm eX2 ABL MLC NAND. The competition is heating up as another manufacturer with massive foundry capabilities releases a new SSD. Will the Extreme II "blaze through your day" and "keep you ahead of deadlines?"

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Source: [H]ard|OCP