SSD Write Endurance 25nm Vs 34nm

[johnw]

I still can’t be sure that 177 is the MWI, but for the purpose of the endurance test I’m going to assume it is.

If you fit a line to the 177 RAW vs. 177 normalized values, the slope comes to about 30 raw per 1 normalized. And 100 * 30 = 3000. So it seems likely 177 is counting down, in normalized units, from 3000. Which is likely the expected number of cycles for the flash.

For comparison, with the Samsung 470, normalized 177 attribute hit 1 when the raw value was about 5017, so it seems like the 470 was using flash with an estimated 5000 cycle lifetime.

It is interesting that the WA comes out less than 2 for the "production environment". I wonder if the reason we measured 4 or 5 with the endurance test is because with continuous writing the Samsung never does much GC and so ends up having to do a lot more block erases. But maybe in the production environment, there are sufficient pauses for Samsung GC to kick in? Just a guess.