I used the memory card to transfer files between a netbook and other portable computers that have no DVD or other removeable disk drives. After only four or five transfers, the plastic slider for locking the card slipped into the 'LOCKED' position every time it was inserted in a reader slot. I tried removing the slider but the computers continue to see it as 'Locked' no matter what I did. Hoping for better luck with a SanDisk! Looking at the other 1-star reviews, there appear to be about two hundred other people that have run into this same defect.