Re: Need Help Making GS/OS System 6.0.1 Disks

[schmidtd <schmidtd@my-deja.com>]

On Oct 13, 9:28 am, Greg Buchner <n...@none.invalid> wrote:
> In article <1jqb0al.19vyfaw1t9w4frN%demp...@actrix.gen.nz>,
>  demp...@actrix.gen.nz (David Empson) wrote:
>
> > > I, myself have not had very much luck with with writing to a 800 kb
> > > Prodos disk with the built-in hd drives.
>
> > Depends on the generation of drive. In my experience the early FDHD
> > mechanisms made by Sony with motorised disk insertion were fine (which
> > would include the built-in drive in an SE/30), while later drives from
> > the PowerMac era with manual disk insertion are less reliable when
> > writing to 800K disks.
>
> I have a Quadra 650 that has a manual disk insertion drive. The front of
> the case is even formed like the later PowerMacs so I assume it is
> original equipment. And being a manual inject drive, it writes 800K
> disks that my IIc+ and IIGS can read in their 800K drives with no
> problems.
>
> I seem to recall that the drives were the same between my Quadra 650 and
> my PowerMac 7500 (which can't write 800K reliably) so I assumed that it
> was something to do with the floppy controller Apple used on the 68K
> Macs vs the ones used on the PPC Macs.

I have theories about what's at fault too.  But I find that any mac
with an 800k drive can make a reliable ProDOS disk with DiskDup+
rather than relying on DiskCopy or the OS itself.  DiskDup+ bangs on
the hardware such that it gets the timing right every time.

http://www.apple2.org.za/gswv/a2zine/Utils/