1. Forum
  2. FidoNet
  3. ALT.OS.LINUX.MAGEIA

  • Determine type of CD format?

    From Markus Robert Kessler@2:250/1 to All on Thu Aug 10 16:50:12 2023
    Hi everyone!

    Well, sounds somehow strange, but:

    I have received a CD filled with cardiac CT images. The disc seems to be around 1/3 full, so, assuming 200-250MB of data.

    Unfortunately, the physicians used a filesystem (joliet or something
    else) that I cannot mount. Even copying /dev/sr0 to file does not work.
    The CD drive tries to read, stops, tries to read, stops. Over and over.

    B.t.w., I have no windows machine to test with.

    Anyone have an idea, how to check, what filesystem this is?

    Thanks!

    Best regards,

    Markus


    --
    Please reply to group only.
    For private email please use http://www.dipl-ing-kessler.de/email.htm

    --- MBSE BBS v1.0.8.4 (Linux-x86_64)
    * Origin: A noiseless patient Spider (2:250/1@fidonet)
  • From David W. Hodgins@2:250/1 to All on Thu Aug 10 21:24:29 2023
    On Thu, 10 Aug 2023 11:50:12 -0400, Markus Robert Kessler <no_reply@dipl-ing-kessler.de> wrote:

    Hi everyone!

    Well, sounds somehow strange, but:

    I have received a CD filled with cardiac CT images. The disc seems to be around 1/3 full, so, assuming 200-250MB of data.

    Unfortunately, the physicians used a filesystem (joliet or something
    else) that I cannot mount. Even copying /dev/sr0 to file does not work.
    The CD drive tries to read, stops, tries to read, stops. Over and over.

    B.t.w., I have no windows machine to test with.

    Anyone have an idea, how to check, what filesystem this is?

    It's a Microsoft extension to iso9660. http://www.faqs.org/docs/Linux-HOWTO/CDROM-HOWTO.html#AEN1328

    There's also Rock Ridge ... https://wiki.osdev.org/ISO_9660#Rock_Ridge_and_Joliet

    Make sure your kernel is configured to support it ...
    # zgrep CONFIG_JOLIET /proc/config.gz
    CONFIG_JOLIET=y

    To create a cd with Rock Ridge...
    # rpm -q -i xorriso|grep ^Sum
    Summary : ISO 9660 Rock Ridge Filesystem Manipulator

    # grep -e iso -e fat /etc/filesystems
    exfat
    iso9660
    vfat

    I got tired of replacing cd/dvd drives that stop working due to me being a heavy smoker. Haven't used one in years, so don't remember all of the details needed to work with them.

    If I remember correctly, it must be mounted using vfat.

    Regards, Dave Hodgins

    --- MBSE BBS v1.0.8.4 (Linux-x86_64)
    * Origin: A noiseless patient Spider (2:250/1@fidonet)
  • From Markus Robert Kessler@2:250/1 to All on Fri Aug 11 11:08:38 2023
    On Thu, 10 Aug 2023 16:24:29 -0400 David W. Hodgins wrote:

    On Thu, 10 Aug 2023 11:50:12 -0400, Markus Robert Kessler <no_reply@dipl-ing-kessler.de> wrote:

    Hi everyone!

    Well, sounds somehow strange, but:

    I have received a CD filled with cardiac CT images. The disc seems to
    be around 1/3 full, so, assuming 200-250MB of data.

    Unfortunately, the physicians used a filesystem (joliet or something
    else) that I cannot mount. Even copying /dev/sr0 to file does not work.
    The CD drive tries to read, stops, tries to read, stops. Over and over.

    B.t.w., I have no windows machine to test with.

    Anyone have an idea, how to check, what filesystem this is?

    It's a Microsoft extension to iso9660. http://www.faqs.org/docs/Linux-HOWTO/CDROM-HOWTO.html#AEN1328

    There's also Rock Ridge ... https://wiki.osdev.org/ISO_9660#Rock_Ridge_and_Joliet

    Make sure your kernel is configured to support it ...
    # zgrep CONFIG_JOLIET /proc/config.gz CONFIG_JOLIET=y

    To create a cd with Rock Ridge...
    # rpm -q -i xorriso|grep ^Sum Summary : ISO 9660 Rock Ridge
    Filesystem Manipulator

    # grep -e iso -e fat /etc/filesystems exfat iso9660 vfat

    I got tired of replacing cd/dvd drives that stop working due to me being
    a heavy smoker. Haven't used one in years, so don't remember all of the details needed to work with them.

    If I remember correctly, it must be mounted using vfat.

    Regards, Dave Hodgins

    Hi, thanks!

    I checked the above, and a normal CD could be mounted with iso9660 and
    the content was copied to harddisk in a few minutes.

    But after that, I had to read in a DVD.
    It was mounted as filesystem udf.

    The first attempt to copy it was annoyingly slow. The more data already
    was copied, the slower is was. I read similar experiences from people
    running debian. After half an hour I gave up the attempt to copy around
    900 MB. But after reloading and remounting, the data was copied in ~10 minutes. Maybe because they were cached. But anyway, this filesystem
    seems to have severe problems with some DVDs.

    So, again, many thanks for the info!

    Best regards,

    Markus


    --
    Please reply to group only.
    For private email please use http://www.dipl-ing-kessler.de/email.htm

    --- MBSE BBS v1.0.8.4 (Linux-x86_64)
    * Origin: A noiseless patient Spider (2:250/1@fidonet)