Testdisk finds single OnTrack DM DDO partition on Disk.
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I have copied the Disk onto a hard drive using ddrescue.
Given that fdisk reports the sector size as 512 bytes (see attached screenshot), I know that the total size of the DDO partition is 39069063x512=20,003,360,256 bytes.
I also know (from the second screenshot, above) That the first Partition is the FAT32.
I've tried to slice off a section of the disk image:
dd if=OnTrack.img of=Part1-FAT32.img count=15631938 and mount this, but it won't mount.
First I would use the file command on the ontrack container. It may give the offset to the start of the partitions.
Attach a loop device. Include an offset. Then check the loop device.
If the CHS addresses in your second link are absolute locations on the disk, I think you would use for the first partition,
sudo /sbin/losetup -fs /dev/sdc -o $(16*63*512)
assuming 512 bytes per sector in the fixdisk listing and that the disk contents are linear.
The command will return the lo device used. You can use file -s or mount with the loop device instead. E.g. sudo file -s /dev/loop1
I played with a computer like that back in 97 or so. I think you'd be better off trying to get a physical computer with an old bios and try to image the old system back to a disk where they tried this on. I remember trying linux on that deal too and never could figure out a way to access it. The disk doesn't end up being a normal structure as far as I can recall. Part of the bios and maybe parts of the first part of the disk were used together. As you can see, it didn't say with us for very long cause it sucked. It was real difficult to backup and image.
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