I have a one year old (2006) iMac and an external Iomega 100 Zip drive that is less than one year old. A zip disc was in the drive, and I left the computer for a little while, causing it to go to sleep. When I returned, I pressed the spacebar to wake it up, and an error message came on saying the device was not removed properly, but I didn't try to remove it. Maybe I should have clicked the "OK" button on the message, but I didn't do anything, and after a few minutes the zip disc ejected itself (by itself) and the message went away. When I re-inserted the zip disc, this message came up: "The disc you inserted was not readable by this computer." I then re-started the machine, re-inserted the zip disc, and the same message came up. Other zip discs have worked fine since this happened. Did I lose the data on my disc? Did the machine going to sleep with the disc in the zip drive and/or not clicking the "OK" button cause this to happen? Thanks for your help.