---
Reboot is prevented by hardware failure: the mail disk super block has
died. 
---
what operating system has a single superblock on it's filesystems? there
should be as much superblocks as there are cylinder groups on a berkeley
based fs.

from the FFS/UFS manpage on freebsd-4.3-stable:
---
     A file system is described by its super-block, which in turn describes
     the cylinder groups.  The super-block is critical data and is replicated
     in each cylinder group to protect against catastrophic loss.  This is
     done at file system creation time and the critical super-block data does
     not change, so the copies need not be referenced further unless disaster
     strikes.
---
open-/netbsd should be pretty much the same

/k

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