Doomer wrote:
fzabkar wrote:
AFAICT, these SSDs use Samsung's K9PFGY8U7A-HCK0 NAND parts, and they don't have backup capacitors.
The "U" indicates a Vcc range from 2.7V to 3.6V, so ISTM that low Vcc is a non-issue. :o
So 2.75V on Samsung is not an issue but 2.9V on OGZ/Hynix is?
Interesting logic you got there
I didn't say that at all. I meant that low Vcc appears to be a non-issue ... period.
AISI, if Samsung doesn't care about the contents of cache memory, then it must contain nothing that is of vital system importance. It would appear that all cache contents, including unflushed user data, are simply sacrificed when power is lost
Of course this then begs the question, what are backup capacitors used for? My calculations suggest that the capacitor bank on an Intel SSD, for example, is nowhere near big enough to allow even a small portion of the SDRAM to be saved to flash. AIUI most of the RAM cache is used for the FTL and other system related structures, but if they're not affected by power loss, then should we bother trying to save a little bit of user data? No HDD manufacturer does this.
Having said the above, it still goes against the grain to see a device being operated at its design limit. :?
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