I have the problem where one of my USB drives will read 3 or 4 disks, then it won't read any more. But then the next day it will do the same. It's like something it getting overloaded after a few uses.

Strangely I used it yesterday to access all my old Mac formatted Zip disks from university and early design project days and it read all of those disks fine and kept on working until I finished. Very strange.

My SCSI drive never has that issue though.

Also have one of those really slow parallel port drives. Never used it as it came free with my Z64 Mr. Backup years ago. Could be a handy spate for the drive mechanism though.