That makes sense. The particular problem I'm having is that although the first few files on the image are in the correct places, the later ones (such as GAZETTEER) are slightly off. I've triple-checked everything, but I don't know where the error has crept in. It could be in the decoding of the audio signal, or in merging the decoded parts into one, or in the ADFS reader itself, or something else I haven't thought of.
Given the information in this thread, I'm pretty sure I now understand well enough how the disc is structured. So it must be something else.
If I put the full 264MB file on dropbox or similar, could one of you take a look?
If either of you has access to the files on Community Disc 1 South, could you provide me with hashes of some kind? The MD5s of the files I have are
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(When I say "merging the decoded parts into one": decoding the full disc takes days, and kept crashing. So I split it into several sections of about 50MB, which overlapped by a few MB each way. Then I wrote a script to check the overlaps matched and reconstitute the full image.)