Hello John, In https://bugs.debian.org/1079619, someone found that building cpmtools against libdsk stops it being able to read their TIM-011 disc image.
I think this is due to libdsk's dg_opusgeom() mis-detecting the TIM-011 boot sector as an Opus Discovery one, and thus initialising the geometry with garbage. (Lots more information in the bug, which I have CC'd on this mail.) I think dg_opusgeom() needs to become more discriminating, but I don't know enough about the Opus Discovery to suggest how. (Arguably there should also be more defenses elsewhere; I might submit a patch to cpmtools to be more defensive here.)
