Emax

Your ZIP drive sounds like it has the "Click of Death", it's quite common for 
ZIP drives to get, don't put any more disks in the drive, just replace your 
ZIP drive.  Search the internet for Click of Death info, there is a great 
Windows diagnostic program at www.grc.com that can detect the Click of Death 
in ZIP drives before it ever starts destroying your disks.

It's important for everyone to be familiar with this Iomega hardware problem.

David Beckman
http://members.xoom.com/ESIsamples/