[I agree, it dfoes sound a lot like TRS-DOS's HIT]
So my question is, are there any published works
documenting the TRS-DOS
file system on-disk format, especially the use of the HIT table, other
than "TRS-80 Disk and Other Mysteries" by H. C. Pennington?
Rather later than TRS-DOS 2.0, but still very much 'prior art' for today,
I beleive the source code of LS-DOS 6 (essentialyl TRS-DOS 6, from teh
mid 1980s) was published. It's certainly officially available now. I
assume that contains information on the HIT usage.
-tony