I’m having the same problem, but I cannot run any diagnostic programs. Windows recognizes the drive in Explorer. But, when I try to run an Error Check, I get a message that “the disk check cannot be performed because Windows can’t access the disk.” I ran a rescan under Disk Management, and updated the firmware. No dice. So, I’m ready to try something new. Does Data Lifeguard Diagnostic for Windows work on a portable drive (My Passport Essential SE)? ARe there any other solutions?