[rescue] imaging old Mac double density floppy disks

Brian Wheeler bdwheele at indiana.edu
Mon Jun 19 14:32:46 CDT 2006

On Mon, 2006-06-19 at 15:24 -0400, kevin wrote:
> Lately, i've been trying to image a bunch of Macintosh formatted 
> DD (double density) floppy disks using my x86 linux box.  It 
> seems to work like a charm for the HD floppies but none of the DD 
> floppies work.
> Someone told me that the old Macintosh DD floppy drives (not the 
> SuperDrives of days past) were "special" and that it was not 
> possible to read older Mac formatted DD floppies using a PC 
> floppy drive.  Anyone know if there is any validity to this?  I 
> thought that none of that would be relevant if i was using dd 
> (i'm not mounting the disks, just trying to image them).
> I'm using the following:
> $dd </dev/fd0 >./mac_floppy.img
> Any ideas?

I seem to recall that the 400K/800K were variable speed depending on
what track you were looking at.  I believe you can only read them on an
old mac (or using a catweasel)


> Thanks,
> K
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