This flash drive has become write-protected unexpectedly after not being used for about a month, although no settings have been changed. Now I can only read the data which were put into the drive before the drive became write-protected, but I cannot transfer new data to the drive or delete anything. When I try to do this, I get message "Error Deleting File or Folder" with a text "Cannot delete FolderName: The disk is write-protected. Remove the write-protection or use another disk." And there is no way I can make it not write-protected. I am dissatisfied with this situation because I really needed to use the drive and could not do it. As I have purchased it on December, it's too late to give it back (there's 30 day return policy) and there is no option in Amazon which would allow me to contact the supplier. This product looked like a bargain at first, but actually it was a waste of money.