OK, I appear to have entered the disaster zone.
I took the drive out of my peg and put it into my A1. I couldn't get it to show up, no matter what jumper settings I used, although I realised when I awitched my A1 on that the dodgy partition has a namesake on the A1 but not all the partitions have the same names, so I was exoecting the others to show up?
Anyway, no joy, so I thought I'd begin plan b and put the drive back in the peg. Now the thing won't boot.
I get "error while trying to load or boot" and even attempting to boot from the original MOS CD (boot /pci/cd boot.img) doesn't work; "no filesystem recognised".
To further antagonise me, there is a pro-station audio track on the dodgy partition which is nearly finished. I had a fairly recent back-up on another partition but when I loaded it, some of the audio files were corrupted. Now I can;t get to them at all, so I guess that's moot.
I'm now starting to rant and mutter - I better have large drink.............