Well..... if you fancy doing it just for fun, I've seen drives with 'issues'
being sold on ebay. Nearly bought one myself just so I could try swapping the
controller board.



That does work occasionally, or did. Years ago I swapped the controller
on a 1.2gb Connor drive, at the time it was reasonably big, used the
drive for the next 3 years on the transplanted controller with no
issues. I've tried it one other time on a newer 30GB drive and it didn't
work.