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
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