SSD Write Endurance 25nm Vs 34nm

[johnw]

Maybe something kept the M4 controller from reinitializing on power on? I find it hard to believe that the M4 just quit working after being powered off for a few days. But the drive can't be seen by the bios at all, so its pretty much dead.

I think it is obvious what happened. Same as happened to the Samsung 470. Once the unpowered data-retention time gets down to a few days, powering off the SSD for several days causes most of the flash to lose its charge. Since the SSD stores critical metadata on the flash, the SSD cannot operate once most of the flash has lost its charge.