I ordered and received two of these. I used 4 gigs of one to save a large installer. After a few hours I decided to use another flash drive for it. When copying to the second drive, my copy no longer pointed to invalid media. Then Win10 started asking me if I want to format the drive. I couldn't get the drive to work. I couldn't format it. I decided to plug in the first drive and make sure the data was still there. Akk, I ran into the same problem almost immediately. I went to the ADATA website hoping to make a warranty claim. I had to register to do anything on this site. I found a recovery program on their website which I downloaded. This program was clunky and time consuming, but saved disks. The recovery program couldn't reformat the two drives, but Win10 could. I've since used both drives as I originally intended and they seem to be working. I just wonder if they will continue to work.
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