Well, run through the equation.. Someone check my math here..
64,000,000,000 bytes on the drive
* 10k write cyles
divided by the write speed (70,000,000 peak)
Gives you the life in seconds, divide by 60
Gives you the life in minutes, divide by 60
Gives you the life in hours, divide by 24
Gives you the life in days, if writing over and over non stop (like say you got stuck in a secure erase program):
Definitely not 51years, not even a year.. But put into realistic terms, under normal use, and with wear leveling actively moving your data around to prevent any one cell from seeing full activity, you'll probably go 5 years before you have a single cell die of overuse. That 10k is a guaranteed minimum, it's very likely you'll get far more writes out of each cell than that. And with the intelligent wear levelling controller in place, when a cell does die, you never know about it, it marks it bad in it's internal log, and the drive slowly starts to get smaller. It's not a catastrophic failure event like a normal hard drive that has a bad sector that tends to bring the whole drive to it's knees.
Maybe my math is wrong, and I'm underestimating the life span?