I have a USB drive (8GB - i think its a mini HDD rather than flash) which i haven't used for a while and i lend it to friends a lot. Since i last got it from a friend i haven't used it until now and it doesn't seem to work! I plug it in to my mac and the light on the device comes on but then it doesnt come up on the desktop. Does anyone know of a way i can see if it works, maybe with some diagnostic software??