You have a A1000 and seem to be well versed on amiga. Floppy drives on anything don't work well; amiga or PC. Of course floppies work much better on amiga's. The floppy drives on amiga's actually cost more than a dollar, but very old!
Since, you say they worked yesterday I guess you might have some kind of drive or controller problem. Clean the drive and I would even say have a computer tech ie.. amiga tech (good luck finding one)do the cleaning. You have two amiga's you could trouble shoot the drives and floppies on each system. If it does work on the A1000 then you know you have some issues.
Floppy disk go bad a lot more often then the disk drives do ,but both have problems often.I have a A2000 mobo that I might be getting rid of and it has a 2091 scsi controller. You could just buy the 2091 from me if you like.PM me if interested. :-D :-D :-D :-D
