Computer question Voice Card  -  Volume 2  -  Holly Card Number 15  -  Fri, Oct 14, 1988 10:33 PM A few weeks ago I visited friends who have a MacII. I took my disks on the visit and we shared some projects. Tonight the disk I had put in their machine was unreadable in mine. Fortunately I had a back up. Why was the disk unreadable? Was it because I had put it in a MacII and mine is an SE?