Either the USB-to-disk-drive adapter inside the casing has failed,
or your USB port has failed,
or the disk-drive inside the casing has failed.
Try a different USB port. Try a different computer.
Disassemble the casing, and remove the disk-drive.
Temporarily attach it as a "slave" drive in a desktop computer,
and see if the drive is detected, and if the files are OK.
If all else fails, and the Passport is still under warranty, exercise the warranty.
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