restore superblock

Wojciech Puchar wojtek at
Wed Dec 3 11:58:58 PST 2008

fsck_ffs -b

  An alternate super block is usually
              located at block 32 for UFS1, and block 160 for UFS2.

On Wed, 3 Dec 2008, PJ wrote:

> I have been googling for superblock restore and things are a bit confusing. 
> Some of the commands don't seem to match current fsck parameters (notably -b 
> doesn't exist.
> Apparently I should be able to reconstruct the superblock(s) on my /usr 
> partition (slice ?) as my searches found that there are backups of the 
> superblocks on the files systems.
> But how do I find them and restore the corrupt ones? Not clear in my 
> searches.
> I have another installation of fbsd 7.0 on another machine with the 
> partitioning identical and identical hdds.
> How could I use the superblock and/or other information from the good 
> installation to repair the damaged one - or would it be possible to recover 
> the superblock info from the damaged one's backcups?
> Phil Jourdan
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