Maybe they don't have a drive letter assigned (use disk management).
Did you run a chkdsk from the cmd line?
(start,run,"cmd") then in text window type "chkdsk x: /f" where x is the letter for the drive.
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desktop - foobar > m-audio > coax > super-dac > gilmore dynamic > k701
laptop - foobar > usb > Audiotrak DR.DAC2 DX > k701
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