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unable to set superblock flags

An ext3 filesystem would not mount today :(
Running e2fsck (under MacOS 10.4/ppc) only gave:
$ e2fsck -fv /dev/rdisk0s4
fsck.ext3: unable to set superblock flags on /dev/rdisk0s4
Then I remembered to try with a dfferent superblock, and it worked perfectly:
$ mkfs.ext3 -n /dev/disk0s4 
[...]
Superblock backups stored on blocks: 
        32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632
Note: Don't forget the -n option, otherwise mkfs.ext3 will really format the partition!
 
$ e2fsck -b 32768 -fv /dev/rdisk0s4 
[...]
$ mount_ext2 /dev/disk0s4 /Volumes/disk0s4/
Now mounting succeeds again. Yeah, ext3 ;-)

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Richard on :

Thank You!!

Christian on :

Wow, such an old post of mine - glad you found it useful :)

jonathan on :

Thanks! Helped me out on my Linux box

Steve on :

dumpe2fs /dev/rdisk0s4 | grep -i superblock Safer way to find the alternative superblock

niky on :

THANKS. you just saved me half a headache (I already got half of it by the time I found this).

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