[rescue] imaging old Mac double density floppy disks

[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