Review on Alihelan 10pcs 4GB USB Flash Drives - USB 2.0 Thumb Drive Bulk Swivel Memory Stick 4 GB Fold Storage Jump Drive Zip Drive - Pack of 10 in Yellow by Manni Diaz

First two out of the box: I couldn't text them. Wrote a file to the first disc, and then the disc disappeared. I ran diagnostics and said the discs are defective. I tried formatting the first drive and Windows said the format failed. UPDATE: I tried them on my laptop and they seemed to work, although Windows reported disk errors when I inserted them, but found no errors when I repaired them. Laptop USB slots are very tight. I tried several flash drives on my PC again and found that if I force them, which I don't have to do with other flash drives, they would work.