"Storage enthusiasts sitting on the edge of your seats for revolutionary SSD announcements out of this year's CES can rest easy: there's not anything mind-blowing coming up that you need to be worried about. Ars sat down today with both LSI/Sandforce and Samsung, and while both had plenty of neat stuff to talk about with regards to their current product line, neither had anything earthshaking to share. Like the headline says, this isn't necessarily a bad thing: now's an excellent time to buy an SSD if you don't already have one, and the ever-present enthusiast fear of buying something that'll soon be obsolete or out of date isn't one that really applies for solid state disks.
Kent Smith, the senior director of product marketing for the Flash Components Division of LSI (which makes the enthusiast-friendly Sandforce SSD controllers featured in many consumer SSDs) noted that business has been quite brisk, with Sandforce controllers appearing in many, many different OEMs' drives. Kent compared the situation today to the hard disk drive market twenty years ago, with a plethora of manufacturers producing only moderately differentiated disks. But there are only two real HDD OEMs today: Seagate and Western Digital (or three, depending on how one counts Toshiba). Anyone can use Sandforce controllers in their disks, but the sheer number of OEMs making SSDs is unsustainable, and some collapse and consolidation is inevitable.
The reasons why tie in with NAND flash's much-discussed longevity issues. SSD prices themselves are low and will get lower, but the vast majority of SSD makers aren't actually manufacturing their own NAND, but rather sourcing it from one of several manufacturers. NAND's increasing density and complexity brings with it integration issuesas NAND gets smaller and more cantankerous, it can be more difficult for an OEM who sources both NAND and controllers and melds the two together to make drives. The OEMS that can dedicate the most time to it will produce fast and power-efficient devices, while others will be pushed out of the market by decreasing costs and decreasing margins.
The message from Stephen Weinger, Director of Marketing of NAND flash for Samsung, was similar. Samsung is in a different market position from LSIas a vertically integrated manufacturer, Samsung makes "the whole widget," from controller to NAND, rather than just the controller. However, they see the same outlook for the SSD manufacturer space as LSI: the number of companies in the space is bound to become considerably smaller. Weinger noted that in 2012 OCZ missed its second quarter earnings targets due in part to supply issues with sourced NAND, and he indicated that anticipated SSD business in 2013 will likely cause these constraints to become more widespread among other SSD OEMs.
Samsung is one of the only SSD OEMs to be selling a triple-level cell (TLC) SSD, the Samsung 840. As we discussed in our huge feature set on how SSDs work, TLC SSDs store three bits of data per NAND transistor, requiring the ability to discretely read and write eight different voltage levels. The nature of NAND cells means that as they get smaller and denser, they become more susceptible to wear from repeated erasures and rewrites. A TLC NAND transistor with its eight discrete voltage states has a much-decreased lifecycle than an SLC or MLC transistor, because reading from or writing to it requires much more precision and residual charge damages it more quickly.
The Samsung 840 gets somewhat of a bad rap in comments on Ars when it comes up, but Weinger noted that in Samsung's own internal, their TLC NAND came out with about thirteen years of usable life when tasked with the write equivalent of about 40GB per day. This is possible because of the advanced tricks that modern SSD controllers (like Samsung's and LSI/Sandforce's) do to overcome write amplification. At the high level, this usually includes deduplication (writing repeating data only once) and compression, but both companies we talked to jealously guarded their controllers' "secret sauce." Samsung didn't have any post-TLC tech on sale, and noted that the inevitable transistor shrinking march of Moore's Law will likely continue on relatively unabated in NAND flash, asserting that the company is capable of keeping up the pace.
A fast-moving market and hotly in-demand products means that companies in the SSD space, at least for the next few months, will be focused on polishing and refiningreducing power consumption, handling write amplification, and stepping down to the next NAND process size. We'll see cheaper MLC and TLC SSDs from major OEMS, but it'll be some time yet before anyone's announcing more exotic replacements like consumer-targeted memristor drives or anything like that. If you've been holding off buying an SSD because you were afraid of something newer coming out, now's as good a time as any to pull the trigger.