Comment 2 for bug 354362

Ditto above. I unmounted a volume on an external USB Western Digital Passport 320Gig drive, when I had not even done anything with the volume between mounting it and trying to unmount it. The volume was the first of three partitions on the drive, all FAT32 formatted (because they need to interface also with a computer running XP). Following the error, I was able to unmount the remaining two partitions successfully.