Bug#1114585: BDR burning on Debian

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

Hi,

i cannot say much about K3B, iso i make a few general statements
about BD-R recording on Debian.

> - K3b burn @ 1.9x

That's probably Defect Management on formatted BD-R, which checkreads
the medium during writing. I'm not a big fan of it.

growisofs formats BD-R media by default, which enables Defect
Management, unless the drive gets told to prefer speed over pickiness.

cdrecord, cdrskin, and xorriso do not format BD-R by default.

cdrskin option stream_recording=on and xorriso command
-stream_recording "on" disable Defect Management with formatted BD-R
and with BD-RE (which cannot be used unformatted).

Xfburn is supposed to work with BD-R and to offer a checkbox
"Stream Recording":
  https://docs.xfce.org/apps/xfburn/start
It uses the same libburn as xorriso and cdrskin do.


> Impossible to burn blu-ray archive files correctly on Debian.

I do my backups by help of xorriso of which i am the upstream
developer.

See a simple example from the generously sized man page
  https://manpages.debian.org/trixie/xorriso/xorriso.1.en.html
slightly modified for archive-grade fidelity, drive address,
and recording speed:

  xorriso -for_backup \
          -outdev /dev/sr0 \
          -blank as_needed \
          -stream_recording on \
          -map /home/me/sounds /sounds \
          -map /home/me/pictures /pictures

This run enables recording of MD5 checksums, ACL, and extended file
attributes. It chooses drive /dev/sr0 and blanks the medium if it is
a written CD-RW, DVD-R, DVD-RW or an overwritable medium with an
ISO 9660 filesystem. It disables slow and picky Defect Management.
Then it copies the hard disk directory tree /home/me/sounds to the
directory tree /sounds in the emerging ISO. The same with "pictures".

The recorded MD5 checksums can later be verified by

  xorriso -for_backup -indev /dev/sr0 -check_media --

to check superblock, directory tree area, and file content area,
Use

  xorriso -for_backup -indev /dev/sr0 -check_md5_r sorry / --

to check the individual file's content in the data area.
This will be able to tell the names of damaged files, after
-check_media has confirmed superblock and directories but reports
mismatch of the overall file content area.


Have a nice day :)

Thomas