mount reiserfs .dsk image failed : can't read superblock

jalil1408 · 02-26-2015, 02:00 AM

I have a failed 160 GB Western Digital Netcenter NAS disk and its image after failing in .DSK format.

When I connect the disk to my ubuntu machine and typed:

Code:

# losetup -o 512006144 /dev/loop1 /dev/sdc      
# mkdir /tmp/sdc
# mount -r -t reiserfs /dev/loop1 /tmp/sdc

I get my folders and files in the /tmp/sdc folder then I can copy some files and folders but at a very slow speed.

When I try to get them from the .dsk file with:

Code:

# losetup -o 512006144 /dev/loop2 /media/wdnas.dsk      
# mkdir /tmp/dsk
# mount -r -t reiserfs /dev/loop2 /tmp/dsk

In the mount command I got:

Code:

mount: /dev/loop2: can't read superblock

How can I fix that?

I compared the disk content and the .dsk file in a hexadecimal editor and they look the same!

Ref: http://tristanscott.co.uk/computers/...data-recovery/

jailbait · 02-26-2015, 07:16 PM

Each file system has multiple copies of the superblock. fsck has the capability to use an alternate superblock when repairing a file system. You could try running fsck against the loopback partition. I think that the command you need is:

reiserfsck --rebuild-sb /dev/loop2

However it has been several years since I last worked on a corrupt superblock and with loopback devices so you better try it first on a copy of your data that you can afford to lose.

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Steve Stites

michaelk · 02-26-2015, 07:17 PM

Is this a real dsk image or did you use the dd command to clone the drive? A real dsk image is not the same thing as a image made via the dd command and is not mountable.

If this a image made via the dd command did you calculate the offset or did you just use the number given in the article? I would not assume the same offset number.