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От : Markus Robert Kessler 2:5075/128 11 авг 23 10:08:38
К : David W. Hodgins 11 авг 23 13:11:01
Тема : Re: Determine type of CD format?
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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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