Re: Unidentified subject!

["Thomas Schmitt" <scdbackup@gmx.net>]

Hi,

Andrew M.A. Cater wrote:
> As somebody testing images when point releases are made, I
> would suggest against using larger images than the DLBD - there is the
> likelihood of bit errors to ruin your image when writing many GB

There is a file md5sum.txt in the ISOs to check the transport integrity
of the packages and some other files.

  https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1011343#180
gives my re-narration of the checksum run of internal Debian tool
  https://packages.debian.org/unstable/cdrom-checker
:

 (cd /mnt/iso
   cat md5sum.txt | while read line
   do
     if echo -n "$line" | md5sum -c 1>/dev/null 2>&1
     then
       dummy=dummy
     else
       echo "BAD: $line"
     fi
   done ) 2>&1 | wc

I dimly remember that cdrom-checker is part of a check offered by the
installer in the ISO.
This run with mounted debian-12.7.0-amd64-netinst.iso reports a match:
  gunzip < /mnt/iso/install.amd/initrd.gz | fgrep 'cdrom-checker'

But that's much more your realm than mine.


Damage after the end of the directory tree area of a Debian ISO hits
only the content of particular data files. A single byte can spoil not
more than one data file (and its hardlink siblings, like with the
three vmlinuz files in the netinst ISO).
With debian-11.2.0-amd64-DVD-2.iso the size of the directory tree
is 6 MB. Multiplied by 21 DVD ISOs for 12.10.0 = ~ 126 MB.


Have a nice day :)

Thomas