[rescue] imaging old Mac double density floppy disks

wa2egp at att.net wa2egp at att.net
Tue Jun 20 20:13:28 CDT 2006

 -------------- Original message ----------------------
From: wa2egp at att.net
>  -------------- Original message ----------------------
> From: kevin <kevin at mpcf.com>
> > 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?
> > 
> > Thanks,
> > K
> IIRC (and that may not be likely) the DD were 720K and the HD
> were "similar" to PC disks.  There was once a way to read 720K
> disks from DOS but I think that "feature" has been deleted or
> crippled in some way.  Maybe fooling the PC into thinking the 
> 3 1/2 drive was the old B drive (5 1/4) you might do it.  I never
> played with it so YMMV.  :)
> Bob

Just read another post which jogged my memory.  Yeah 400/800. :(
Didn't realize that the superdrive was 1.6 M.  I know there was
an app that would write to a PC disk but I don't remmber if it
was more recent vintage.  Otherwise, you could get an old Mac 
and have Appletalk commuicate to a PC......  :)



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