Keir Fraser

Thanks for the PR. I will have a closer look when I have time but I'm pretty sure it all looks sensible.

(1) and (3) are now done. For (2) it is always done in, then out, every time. Is that not good, and why do you need it done back to...

I've heard of this before I'm sure. I wonder if the Amiga disks had IBM-format data on cylinder 80 too. Maybe this is worth adding to disk-analyse as a command-line...

If MFMWarp format was documented I would add support, but I don't think it is.

As in periodic blinking, say 1Hz cycle?

It looks to me like the drives don't like the higher angular bit densities on the outer tracks (note they're not really linearly more dense -- that's the point of...

I've ordered some Macintosh disks off Ebay. Hopefully they are GCR 400k or 800k disks. Might make sense to wait for me to investigate those.

I received my disks, and they are indeed GCR 800k. On my default dump drive (NEC FD1231M) I see the exact same behaviour in the HxC analyser (cylinders 0-15 are...

Here's a plot of track 0 (three revolutions) in gnuplot. y-axis is time (us), x-axis is flux number:  And here is the HxC plot of that track: 

Do they look similar? Not really. So HxC is cooking[*] the input data even on track view. Worth remembering! [*] At a guess, we see the bitcell timings after conversion...