[Coco] hybrid CoCo-CP/M disk

[Darren A.]

> >From CP/M's point of view, there is a 3 extent long file occupying
>groups 0x21-0x4a.  On the CoCo side, granules 0-0x21 are allocated.
>
>There is some wasted space, as group 0x4a starts on track 17, sector
>17, and continues for six sectors into track 18, but that's not my
>fault, 8 sector groups just don't come out even on 18 sector/track
>disks.
>
-

You probably don't need to include group 0x4a since Disk Basic does not use 
sectors 12 to 18 on Track 17. The last directory sector is 11, all remaining 
sectors are described as "for future use" in the Disk System Manual.

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