Well, you've made a backup of the partition so the partition table on sda is
irrelevant. Did the partition table on sbd point sdb1 to the wrong spot?
Unlikely.
Your superblock may be messed up. Linux Ext filesystems keep backups of the
superblock. Just try to mount the filesystem with one of the backups:
sudo dumpe2fs /dev/sda7|grep superblock
This will list the superblocks. You need to multiply the block size by four to
translate from disk blocks (512 bytes) to filesystem blocks (4096 by default).
Something along the line also uses 1024 sized blocks so that's why 4 is
appropriate. for example:
Backup superblock at 32768, Group descriptors at 32769-32771
32768 * 4 = 131072, so,
a...@andy-desktop:~$ mkdir mnt
a...@andy-desktop:~$ sudo mount -r -o sb=131072 /dev/sda1 mnt
a...@andy-desktop:~$ ls mnt
bin etc initrd.img.old mnt sbin tmp vmlinuz.old
boot home lib opt srv usr
cdrom initrd lost+found proc store var
dev initrd.img media root sys vmlinuz
Use sda7 in your case... I hope this helps.
Andrew Zajac
--- On Wed, 11/4/09, Trio3b <[email protected]> wrote:
From: Trio3b <[email protected]>
Subject: [Bug-ddrescue] ddrescue and partition table
To: [email protected]
Received: Wednesday, November 4, 2009, 1:06 AM
mandriva linux. 40gb hdb (hdb1 34gb, hdb3 3gb) used for backup went bad.
error message "no permissions"., or wrong fs, bad superblock etc.
Moved to new PC with hda. partitioned
hda1 - /
hda6 - /home
hda7 - /resue 42gb specifically to hold hdb1
tried ddrescue -n /dev/hdb1 /dev/hda7 logfile
now hda7 won't mount with same error message of "no permission" or wrong
fs, bad superblock
permissions are given
I believe partition table of hdb is corrupt. Is ddrescue copying bad
partition table from hdb to hda7 so it won't mount?
Any help appreciated
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