USB Drive is unrecognized in Mac OS X
I had this problem specifically with Mac OS X 10.3. A series of thumb drives were not being recognized by the Finder or Disk Utility.
The fix was quite simple.
- Remove thumbdrive.
- Insert a USB device that does work – keyboard/mouse, wireless adapter, audio card, etc.
- Insert thumbdrive. In a few seconds, the drive will mount or you’ll receive a format prompt.
David Gregory Medina