SSD Write Endurance 25nm Vs 34nm

[Christopher]

OK never mind, I've figured it out myself. By looking into the figures in the OP of this thread, it is very obvious that the MWI is simply calculated by the P/E spec of the flash. For M4, the P/E spec is 3000 cycles, and so the MWI of the M4 64GB should last for 59.5GB * 3000 / 1024 = 174.3 TB, which is pretty close to that of the test result of the first M4 64GB sample in this thread. It also works the same for the Samsung 470 64GB. I'm just a bit slow to follow you guys here

I've not had the opportunity to observe my M4 decrease MWI, but other drives operate differently. Also, the NAND in the M4 is rated at 3000PE cycles, but it really should be rated at 5000.

An Indilinx drive typically has high write amplification with random data, so MWI on a 120GB Turbo may drop after 100MB of host writes (when used as a OS drive, sometimes less). So running ASU will typically take much more host writes to do reduce MWI by 1. Actually, MWI with Indilinxes are kind of wonky anyway so perhaps they're not the best example.

I just opened a brand new 64GB Vertex Turbo last night, and it was at 97 percent out of the box (1.7FW). A brand-new Vertex EX 60 was at 89 MWI out of the box when I unsealed it last week (1.3FW).

The 64GB "Real Turbo" is not half as awesome as Bluestang's M225 Turbo, at least not on 1.7FW. It also had 5 erase failures out of the box too.

That doesn't mean the MWI is a good indicator of anything in and of itself. When taken in context with other factors, it can help give you a picture of what is happening -- but its just part of the picture and doesn't mean much on it's own.