Probably not too useful a remark, but I remember from years ago when we had
some Xerox Altos at the Stanford computer science department that the disk
drives were very prone to head crashes. We were instructed to never attempt
to remove the disk pack under penalty of flogging (or some less colorful
words). So, I hope once Nick gets the voltage problem fixed, he's not
disappointed to find out that disk doesn't work anyway. :-/