SSD Write Endurance 25nm Vs 34nm

[johnw]

Assuming perfect wear leveling such that every page/block is written to once for every 40GB and a write amplification of 1.0 then 1 program/erase cycle for every page/block on the whole drive represents 40 GB. So for a 25nm flash NAND 40 GB drive with a theoretical p/e c. of 3000 then 3000 x 40 GB = 117 TB of data.

I'd say that is a low-end estimate. The Intel SSD probably has 40GiB of flash on-board (not counting parity flash on the 320), and Intel has made some comments leading me to believe that they think their 25nm flash is specified at 5000 erase cycles, so we could estimate the specified writes at:

40*(1024)^3*5000 / 10^12 = 214 TB

With 1.1 WA, that comes to 195TB.

Interestingly, One Hertz just reported 107TB and 45% wear indicator. That comes to:

107 / (100% - 45%) = 194.55 TB