Did My flash memory die?

william_90

Honorable
Feb 2, 2013
174
0
10,680
Patriot axle 64Gb,
i never exceeded 20/30gb for sometimes, but recently i wanted to add 50Gb to it
the speed was 5Mb, so long to wait so i did it in night and when i woke up i saw an error saying; there's no device.... I plugged it out and in, there was my files but i couldn't cut them, nor adding anymore files, 20Gb empty space was there

when I tried Formatting it, i didn't choose quick format, then it took 4 hours and finally paused at almost 80% for an hour, i cancelled it but after that when i plug it in it says, u need to format it, and when u want to do it, windows is unable to do so

for doing RMA when i asked they said they wont replace it, they'll do some
pro-erasing (flashing) thing,

is it going to be the same flash memory and what possible caused this?

thanks