reading bitrotted amiga floppies

[Trev]

Have you looked into Arjuna http://www.siliconsonic.de/arjuna/? It could be used to provide the framework for your decoding/error-correcting module. It currently works with Catweasel cards, but it's open source. Perhaps you could expand it to support your USB drive as well? You'd have to be OK with releasing your work under the GPL, though (or contact the author for a separate license).

[Trev]

@kamiga

That's the point, though. It could be slightly redesigned to use your decoding mechanism (or preferrably, a toggle for either) and a standard set of interpreters. Or something like that. Plus, the author obviously knows a thing or two about floppy disk hardware. It's a good collaboration opportunity.