My PC Said "Drive F: is a FAT 32 Drive" During CHKDSK undo

Thanks for the advice, Darrin! I had this same problem with my external HD which I leave connected to my PC...maybe I shouldn't do that. Anyway, I tried the steps you advised to undo Chkdsk with that drive, but it came back with a message which said, "Drive F: is a FAT 32 drive"

Any ideas on this?