[Coco] Create Nitros9 DSK on SDC

[Jeff Teunissen]

That's actually the problem, Bill. As far as I can tell, you can't
automatically extend a disk image with a CoCoSDC no matter how it's
made. You can format a 35-track disk image with the data for a hard
drive, but it's never going to be able to hold more than 157.5
kilobytes -- you'll start getting errors as soon as you try to seek
past the end of the disk.

Regarding NitrOS-9 and SDF disks, I think it should be entirely
transparent unless you try using the LBA mode (llcocosdc), which
probably does in fact bypass the SDF stuff. I think you SHOULD be able
to use, and format, SDF disks if you only access them using the
regular "rb1773" driver.

On Tue, Aug 25, 2020 at 1:00 AM Bill Nobel <b_nobel at hotmail.com> wrote:
>
> Hi Jeff, I found SDC-DOS doesn’t extend images automatically. The SDC direct commands to create  DSK defaults the disk to 35 try single sided. SDF you can specify the number of cylinders.
>
>  Nitros9 will not support SDF images, but it does auto expand images with the Format command in conjunction with Dmode.  I’ve experimented with SDF in Nitros9 and all I get is error 242 or 244.  It seems the Nitros9 drivers are seeing the inner SDF sector padding (crc’s and such)
>
> Bill
>
> Sent from my iPad
>
> > On Aug 20, 2020, at 11:31 PM, Jeff Teunissen <deek at d2dc.net> wrote:
> >
> > The CoCo SDC does not extend a disk like an emulator can, so disk
> > image files have to be full-sized. To the best of my knowledge, you
> > can't make an image larger than 40-track, double-sided using SDC-DOS
> > (and I don't recall there being a way to make a new image from
> > (Nitr)OS-9).
> >
> > .DSK images are always the same size when created by SDC-DOS, 157.5K;
> > they're only ever 35 tracks.
> >
> > The way to create a DSDD image is using DRIVEx,"DISKNAME.SDF",NEW++
> > (that gets you 40 tracks, double sided).
> >
> > Once the disk image is created, you can boot NitrOS9 and format the
> > new disk (just as you still need to DSKINI a disk image you created in
> > SDC-DOS) just like formatting any other floppy.
> >
> > If you're talking about the giant super-floppies we use as hard
> > drives, the simple answer is, "you can't". You can make an image with
> > Toolshed, using the command:
> >
> >    os9 format DSK_NAME.VHD -n"My Disk" -e -t29126
> >
> > the -t29126 tells it to make the disk (which is otherwise exactly like
> > a single-sided floppy) have 29126 tracks on it, which makes it almost
> > the largest possible disk which still uses only 1 sector per cluster
> > -- the disk is 127.95 megs.
> >
> > The -e makes the disk image full-sized, which lets the CoCoSDC not choke on it.
> >
> > Then just copy the image to your SD card.
> >
> >> On Mon, Aug 17, 2020 at 5:12 PM Ed Orbea <ed.orbea at gmail.com> wrote:
> >>
> >> I know how to create blank disks on an SDC (DRIVE 0,"DSK_NAME.DSK",NEW
> >> and  DRIVE 0,"DSK_NAME.SDF",NEW+) that cna be used to RS-DOS.
> >>
> >> However, how can I create a blank Nitros9 dsk?
> >>
> >> Thanks
> >>
> >>
> >>
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