Wasn't there a similar issue with the hard drive
low-level formatter, in that
it was never released by Apple - so you couldn't take a Lisa ProFile and
format it for a ///, and nor could you do drive replacement in the field -
instead the whole faulty unit presumably got sent back to Apple for repair.
Wasn't there one drive -- and I think it was an Apple -- where you had to
temprorially replace a microcontroller chip to be able to do a low-level
format? And of course that specially-programemd microcontrolller was
never avaialble to normal customers.
-tony