dslreports logo
site
 
    All Forums Hot Topics Gallery
spc

spacer




how-to block ads


Search Topic:
uniqs
469
share rss forum feed

daveinpoway
Premium
join:2006-07-03
Poway, CA
kudos:2

Understanding SSD over-provisioning



koitsu
Premium,MVM
join:2002-07-16
Mountain View, CA
kudos:23
I've read this article, as well as a previous PDF released by LSI in December 2012:

»www.flashmemorysummit.com/Englis···mith.pdf

The whole thing smells/reeks of marketing-driven justification, not technical. I get the impression these jackasses are trying to try and justify, with NAND/RAM-based media, the whole "1000 bytes to a kilobyte" nonsense that MHDD vendors introduced for no justified reason.

If there is truly technical justifications for what the "over-provisioning" areas are used for (citing: 1) Garbage collection, 2) controller firmware, 3) spare blocks, 4) other methods)), then the manufacturers should actually be doing the over-provisioning themselves by including an additional NAND flash chip dedicated to exactly those things.

I'm also utterly amazed that the drive firmware is stored on NAND; that seems like an accident waiting to happen. EEPROM or dedicated Flash (not NAND) chip would be a much better choice. Or even better: integrate that necessity into the underlying FSP itself, much like is done on PIC chips, many of which have their own on-die dedicated RAM.
--
Making life hard for others since 1977.
I speak for myself and not my employer/affiliates of my employer.