Ralf Prengel ralf.prengel@rprengel.de wrote:

I made a backup using dd without any problems but how can I mount this image. Normal loop options don't work.

Too little information. Tell us what you tried (the exact command) and what happened (any error message).

Ok, sorry. Our recoder device that stores all videos of several cameras doesn t work any longer. Before doing anything on the the device or the disk I made a full backup oft he disk with dd. Trying to mount this file simple with mount -o loop save.dd /mnt/backup fails. I found out that VDR are using non-standard disk-configurations and filesystems. So my question if there is a way to get access the files in the image. Tools like parted don t show partions in the bckup-file.

Thanks Ralf

Ralf Prengel Teamleiter Customer Care Comline AG Hauert 8 D-44227 Dortmund/Germany

Telefon:+49 231 97575 157 Mobil:+49 151 10831 157 Fax:+49 231 97575 257 E-Mail:ralf.prengel@comline.de

www.comline.de Vorstand: Stephan Schilling Aufsichtsratsvorsitzender: N.N. HR Dortmund B 14570 USt.-ID-Nr. DE124727422

On Wed, Aug 26, 2020 at 10:04:26AM -0400, Yves Bellefeuille wrote:

ralf.prengel@comline.de wrote:

...

Trying to mount this file simple with mount -o loop save.dd /mnt/backup fails. I found out that VDR are using non-standard disk-configurations and filesystems.

If this were a normal DVD, you'd have to specify the file system:

mount -t iso9660 -o loop save.dd /mnt/backup

But you say the DVD uses a non-standard file system, so this may not work.

...

Tools like parted don t show partions in the bckup-file

DVDs don't have partitions, and I don't think parted would work on an image anyway.

the OP said "DVR, not "DVD".

I'd try fdisk to see if there are partitions, first, then if you find anything that looks likely, try mounting that.

Also, try the "disks" utility, which also may be able to tell you something about the disk.

Good luck!

Fred

It looks like you've backuped an entire disk that might contain partitions. So first check if you have partitions inside:

sudo fdisk -lu save.dd

If you have partitions inside, use the start offset of the partition to create a loopback device (e.g. a partition starts at 56):

sudo losetup -o $((56*512)) /dev/loop0 save.dd

Now you should be able to use the partition. First check and than mount it:

sudo fsck -fv /dev/loop0 sudo mount /dev/loop0 /mnt

xxx

Hallo, no partions are shown with dd. Found an article that some DVR vendors are using their own filesystems. I think that I ve no chane in this case to rescue anything. Thanks for all hints. Ralf

Ralf Prengel Teamleiter Customer Care Comline AG Hauert 8 D-44227 Dortmund/Germany

Telefon:+49 231 97575 157 Mobil:+49 151 10831 157 Fax:+49 231 97575 257 E-Mail:ralf.prengel@comline.de

www.comline.de Vorstand: Stephan Schilling Aufsichtsratsvorsitzender: N.N. HR Dortmund B 14570 USt.-ID-Nr. DE124727422

dd does not show partitions, fdisk does (or parted or ...).

Sorry, my mistake. I used several disktools.

Ralf Ralf Prengel Teamleiter Customer Care Comline AG Hauert 8 D-44227 Dortmund/Germany

Telefon:+49 231 97575 157 Mobil:+49 151 10831 157 Fax:+49 231 97575 257 E-Mail:ralf.prengel@comline.de

www.comline.de Vorstand: Stephan Schilling Aufsichtsratsvorsitzender: N.N. HR Dortmund B 14570 USt.-ID-Nr. DE124727422