I have a friend with a Maxtor One Touch II that he uses to back up his 3 desktops computer (all Dells). Recently the drive stopped becoming available on his Optiplex 620. The drive does show in the Device Manager and in properties displays as working. However in My Computer, Windows Explorer or even Disk Management it does not show up.
I have unistalled device in Device Manager and when plugged back in it reinstalls but is still not available.