So, it appears that the partition with /home on it is fine, but the partition with /data on it has crashed, trashed and burnt. Won’t even mount. /data, as it happens, contains /data/music, /data/web and /data/aquarion/projectsVault.
So that’s a large pile of MP3s that have ceased to be, my backup of Aquarionics and all my archived projects, unless there’s some magic way of rescuing data from a JFS partition without actually reading it that I have yet to discover.
Suddenly, I have an overpowering urge to blow my next paypacket on a DVD writer and a raid system, and forget christmas. Most of the MP3s are also owned by other people, so I will be able to get most of it back, but the projects vault is something of a body-blow.