True, even I am facing the same problem on the 8GB sandisk cruzer that I purchased hardly 5 months ago.
I use cyber cafe and have been using this pen drive as a means to port my data. About 45 days ago, I was using it in the same manner.
The drive was connected to the computer and was working perfectly well for about 2 hours and suddenly it developed some snag which I am not able to understand what.
It now reads as 0 MB. It neither permits write, nor am I able to access the 1.76 GB of data that is stored in it. I tried formatting it through means known to me, my cyber friend. None of it has worked.
The more I analyse the situation, the more I get to think that the the factory embeded software (firmware) has been infected with an unknown virus. True that firmware does not get corrupted/virus infected. Yet,…