[TUHS] Panic! - Unix System Crash Dump Analysis companion CD-ROM

[Steffen Nurpmeso via TUHS]

Adam Thornton via TUHS wrote in
 <CAP2nic0ce6dWuzjf=3Dj+yuRj8qDX-mt2ZVUt+rVordqsoe42Q at mail.gmail.com>:
 |On Mon, Apr 6, 2026 at 11:20 PM segaloco via TUHS <tuhs at tuhs.org> wrote:
 |> I guess the question then becomes whether the multiple bad dumps have
 |> the proper complement of good blocks between them to assemble a proper
 |> image.  This may also suggest performing something like a bin/cue backup
 |> that captures more sector information, that way you can also use that
 |> metadata to better reconstruct a complete image.  This has been done for
 |> a few video games where just enough good blocks could be pulled from
 |> known-but-decayed specimens that the correct image could ultimately be
 |> produced.

 |cdparanoia, last time I used it, was pretty good at recovering data from
 |busted CDs.  I suspect that doing that across multiple copies might indeed
 |get you, in aggregate, a good image.

You may also want to have a look at xorriso[1].

  Can check media for damages and copy readable blocks to disk.

The maintainer had a tremendous run a couple of years ago,
one that included sending kernel patches to certain BSDs (at
least), ie, to improve the ISO 9660 (handling) support, and more.
(Could be ten years even, though .. you know.)

(Thankfully so he did, so i could sit down in the early Corona
months, and write a "modern" digital audio CD accessor program for
BSD* and Linux, s-cdda.c, one that only uses SCSI Multimedia
Commands, for extracting CD-TEXT and such.  Does not test CRC
itself, at least yet, but only certain logical data conditions.)

  [1] https://www.gnu.org/software/xorriso/

--steffen
|
|Der Kragenbaer,                The moon bear,
|der holt sich munter           he cheerfully and one by one
|einen nach dem anderen runter  wa.ks himself off
|(By Robert Gernhardt)