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Operating Systems Linux Mount reiserfs .dsk image failed: can't read superblock Post 302936505 by jalil1408 on Thursday 26th of February 2015 03:13:15 AM
Old 02-26-2015
Mount reiserfs .dsk image failed: can't read superblock

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!
 

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mount_pcfs(1M)						  System Administration Commands					    mount_pcfs(1M)

NAME
mount_pcfs - mount pcfs file systems SYNOPSIS
mount -F pcfs [generic_options] [-o FSType-specific_options] special | mount_point mount -F pcfs [generic_options] [-o FSType-specific_options] special mount_point DESCRIPTION
mount attaches an MS-DOS file system (pcfs) to the file system hierarchy at the mount_point, which is the pathname of a directory. If mount_point has any contents prior to the mount operation, these are hidden until the file system is unmounted. If mount is invoked with special or mount_point as the only arguments, mount will search /etc/vfstab to fill in the missing arguments, including the FSType-specific_options; see mount(1M) for more details. The special argument can be one of two special device file types: o A floppy disk, such as /dev/diskette0 or /dev/diskette1. o A DOS logical drive on a hard disk expressed as device-name:logical-drive , where device-name specifies the special block device-file for the whole disk and logical-drive is either a drive letter (c through z) or a drive number (1 through 24). Examples are /dev/dsk/c0t0d0p0:c and /dev/dsk/c0t0d0p0:1. The special device file type must have a formatted MS-DOS file system with either a 12-bit, 16-bit, or 32-bit File Allocation Table. OPTIONS
generic_options See mount(1M) for the list of supported options. -o Specify pcfs file system specific options. The following options are supported: foldcase|nofoldcase Force uppercase characters in filenames to lowercase when reading them from the filesystem. This is for compatibility with the pre- vious behavior of pcfs. The default is nofoldcase. FILES
/etc/mnttab table of mounted file systems /etc/vfstab list of default parameters for each file system ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWesu | +-----------------------------+-----------------------------+ SEE ALSO
mount(1M), mountall(1M), mount(2), mnttab(4), vfstab(4), attributes(5), pcfs(7FS) NOTES
If the directory on which a file system is to be mounted is a symbolic link, the file system is mounted on the directory to which the sym- bolic link refers, rather than on top of the symbolic link itself. SunOS 5.10 24 Nov 2003 mount_pcfs(1M)
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