>Is the version of fsck on the install floppy a full version?  Or is it so
>cut down that actually it doesn't know how to find a backup SuperBlock?

It is a full version

>Given the geometry of the disc, could calculate where a backup SuperBlock
>will be, and then tell it using the -B option - and even then, would it
>know how to recover it?

try

fsck -b 32 /dev/rsd0a

There will be a superblock backup at block 32.
Alternatively try block 16224 which is often a backup up

You can find where all your superblock backups are

with

newfs -N /dev/rsd0a    etc.

NOTE: The -N is *VERY* important as it causes newfs just to print params rather
than create the filesystem.

>Could it be something else is wrong, such as the bootblock?

The only use RiscBSD makes of the filecore bootblock is for the non-adfs
partition descriptor.


>The system is a RiscPC600 with 24Mb DRAM, 2Mb VRAM, 1Gb SCSI Drive on
>Cumana Card of which 600Mb is RiscBSD, and a 400Mb IDE drive.

Isn't it rather slow running of the cumana SCSI card ? ;-)

Cheers,
				Mark



-- 
Mark Brinicombe				amb@physig.ph.kcl.ac.uk
Research Associate			http://www.ph.kcl.ac.uk/~amb/
Department of Physics			tel: 0171 873 2894
King's College London			fax: 0171 873 2716