[rescue] imaging old Mac double density floppy disks

kevin kevin at mpcf.com
Mon Jun 19 14:52:10 CDT 2006

I've got plenty of old Macs, just gotta get enough pieces 
together to make one workable.  Will OSX (whatever is current) 
read Diskcopy images made from a System 7 era version of Diskcopy?

I would assume that i could install linux on one of my old 680x0 
Macs and use "dd" from there.  Of course, i'd still have to have 
the linux Mac available to put the images back onto floppy....

Anybody know what a catweasel goes for new?

Thanks for the info,

Geoffrey S. Mendelson wrote:
> On Mon, Jun 19, 2006 at 03:24:24PM -0400, kevin wrote:
>> 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).
> They are correct. The bit encoding is completely different, and the
> drive uses a variable speed motor to keep the sector sizes the same.
> It's not that the data is formated differently, the data is ENCODED
> differently.
>> Any ideas?
> Buy a Mac with a 680x0 processor and ethernet. Use MacOS 7 or 7.5
> (both downloadable) and Apple's Diskcopy (also downloadable) to make the
> images. Then you can archive 400k (single sided) and 800k (double sided)
> disks.
> Geoff.

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