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So... I've dumped my 1581 demo disk to a file and had a closer look at it. I didn't expect to find strings like these:
"JUST MOVED INTO A HOUSE THAT WE PLAN ON STAYING IN NOW, PROBABLY FOREVER..."
"ES, AND THE COPY CAN'T BE REGISTERED BECAUSE THE NUMBER ON IT IS ALREADY REGISTERED."
From some more strings I estimate that that's part of a bbs conversation that some people had.
Not sure if they didn't fully wipe their master disk or that was on the disk before it got partially overwritten.

"UST WANT TO INTERJECT THAT MODEM PRICES HAVE COME WAY DOWN IN RECENT MONTHS, AS TECHNOLOGY BECOMES LESS EXPENSIVE... AND YOU CAN BUY A 14,4
BAUD FAX MODEM FOR AROUND $100 NOW..."

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@tokudan have you compared it to disk images available online?

@lastfuture No, because it's not a valid d81 file as used e.g. by vice (yet).
I got a dump of the magnetic flow that the head gives you while reading the disk, which is about 42 MB.
I've used keirf's Disk-Utilities to convert that to a sensible format and got a decent data image, but I'm unsure if that program can correctly interpret the data that a 1581 writes to the disk.

@lastfuture So I got a bit further: The sectors are swapped. For each track the sectors 20 to 39 should be at position 0 to 19 and the sectors at 0 to 19 should be at 20 to 39.
Some shell magic with dd and now I'm able to load the directory and the files on the disk in VICE64.
Now I really need some more disks to verify that it's not just a bad dump. Preferably not just from my 1581, but from others as well.
I shold still have some more disks in the attic... but can I find them?

@tokudan I would have sent you mine if I had any, but all I had was a 1571 and it and its disks have been given off into good hands when I couldn't care for it anymore.
Thanks for sharing your data forensics adventure

@lastfuture That's fine, I still got some more disks, I think. I just need to find them ;)

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