Other Help Topics :: Exact imaging of non-OS floppies?
Well, I tried mounting the floppy, but it refused to mount, so when I used dd the floppy was unmounted?
oh....okay. I did say 'might work' rather than 'will work'
Your i/o error might be related to a corrupt floppy rather than un unrecognized filesystem. I think dd reads and writes raw data regardless of filesystem (<-- again, that's me guessing).
maybe this linux device list is of help. look at the "2 block Floppy disks" section
you say your disks are single or double sided or sigle or double densitie. so you may have to use /dev/fd0H720 or so?
original here.