Have you tried Disksalv or similar? Are there precious files you need to recover?
HDToolBox's Verify Data On Drive feature is for checking the physical media, not the filesystem. So that's no use.
Regarding re-installation, I don't see why you should have to open the A1200 case. Not when there's a PCMCIA slot to hand and also a floppy drive. Just ask RedWarrior if you don't believe me!
