On Fri, 28 Feb 2025, Michael van Elst wrote:
net...@precedence.co.uk (Stephen Borrill) writes:

dumpfs recognises it as a FFSv1 filesystem (mildly surprised as wasn't
sure of partitioning, if any).

file system: /dev/vnd0a
format  FFSv1
endian  little-endian
magic   11954           time    Thu Nov 21 13:09:49 2002

The superblock looks sane,

wapbl version 0x1       location 0      flags 0xffff0002
wapbl loc0 18446744073709486083 loc1 18446744073709551615       loc2
18446744073709551615       loc3 18446744073709551615
usrquota 18446744073709551615   grpquota 18446744073709551615

This here is confusing, since wapbl version and location seem to
be valid while they should be unknown to the native system.

It can only be coincidence.

Interestingly, Linux reads it just fine (copied from another forum):

a680v1: Unix Fast File system [v1] (little-endian), last mounted on /, last written at Thu Nov 21 13:09:49 2002, clean flag 0, number of blocks 40960, number of data blocks 39603, number of cylinder groups 5, block size 4096, fragment size 1024, minimum percentage of free blocks 1, rotational delay 4ms, disk rotational speed 60rps, SPACE optimization

$ sudo mount -o ro,loop a680v1 /mnt/work

$ mount
/home/philpem/.cache/.fr-C4788l/a680v1 on /mnt/work type ufs (ro,relatime,ufstype=old,onerror=lock)

$ ls /mnt/work -la
total 804
drwxr-xr-x 15 root root     512 Nov 21  2002 .
drwxr-xr-x  5 root root    4096 Oct 16 16:59 ..
[snip]

I can share the image with anyone that is interested

Put it somewhere where I can have a look.

I'll send it off-list.

--
Stephen

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