[Coco] Coco disks

[Allen Huffman]

On Feb 1, 2015, at 11:50 PM, Richard E Crislip <rcrislip at neo.rr.com> wrote:
> 
> How did you resolve the non-standard disk issue? I have many 40 track
> dual sided disk and 42 track dual sided disks. TIA


I ended up copying the OS-9 disks under OS-9, so it handles 35, 40, 42 tracks just fine.

For RS-DOS, I may have missed some. I only had one disk clearly marked as 40 track DS (each side appearing as its own drive), but I find several disks with 40TRACKS.BAS on them. Those, most likely, I lost data on doing a 35-track backup IF they had data exceeding 35 tracks worth.

BUT, the plan would be to put RS-DOS in 40 track mode with the patches, and try to back everything up to 40. My sector-by-sector copy would just start failing after track 35 so no harm would be done. I suppose I could even make it fail if track 36 started out unreadable, but that would risk disks that actually had data past track 35 that “just happened’ to have a sector error at the start of track 36.

If I had it to do over, I would have taken that approach.

Question: Does anyone know if the OS-9 “rsdos” command supports 40-track DECB disks? I used that from OS-9 to just pull the files off my identified 40 track disk but wonder if I got all the files. Hopefully it just follows whatever granule the directory says, and should work.
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