source: comp.sys.sun.admin

> I had a similar situation here recently.  Run fsck with the -ob=nn
> option, where nn is the number of a backup superblock.  Try 32 first,
> and if that doesn't work, run newfs -N on the block device in question,
> and pick one of the numbers listed as alternate superblocks at random
> (somewhere in the middle might not be a bad idea).  Use the -y flag
> with fsck too.