I just got Deluxe Video from ebay, and was going to dump it off onto my pc using my a500. I noticed that it started making this horrible squeaking/grinding noise, similar to what happened in this thread. Now, as soon as I heard it, I cut power to the amiga and ejected the drive, not wanting to damage my only amiga disk drive (not to mention my only amiga!) Now, I know it wasn't the drive, since when I put the workbench disk in, the computer ran fine, and other disks worked fine too. The disk looks to be in good condition, and pulling back the metal tab was revealed a clean disk surface. I tried pushing on the disk, and giving it a tap, everything they mentioned. The disk in question is write protected, so I know it wasn't writing data at the time I switched off the amiga, so IF the disk is readable the contents should still be preserved. My question is will it damage my drive if I even try to read it? It never got that far....
Keep the metal shutter open to inspect the disk and turn it around one full revolution by hand. If the disk is clean and dry on both sides, it should be fine in the drive.