1) The REAL Lisa used 5.25" diskettes. Why would a supposed "history" movie ("Pirates of the Valley" had some of the personalities right on, but a LOT (MOST?) of its history was BOGUS) be using a much later model? Didn't the Lisa change over to 3.5" occur AFTER the release of the Mac? (in order to push out excess inventory, by placing the Lisa as a sub-model of the Mac) I think that the REAL Lisa's 5.25" diskettes were 600 Oerstedt (same as, or similar to, "1.2M"). But they had a strange jacket with TWO write access holes, in order to make it possible for users to put thumbprints onto the diskette whichever way they held it. 2) The AMOUNT OF DIFFERENCE in the coercivity is what matters. "360K" diskettes were about 300 Oerstedt, "1.2M" were about 600 Oerstedt, which is so far apart that they would NOT work properly. "720K" were about 600 Oerstedt, "1.4M" were about 750 Oerstedt, which was close enough that you could "get away with it", if you really didn't give a shit about the integrity of your data. You could take a high quality "720K" and punch it to use it as a crummy "1.4M", or you could take a high quality "1.4M" and get away with using it as a crummy "720K". I loved the ad for one of those punches, wherein the guy siad that he had checked WITH MICROMETERS!, and confirmed that "720K" diskette media and "1.4M" (he called them "1.44M") were identical. On Tue, 31 Dec 2002, Ian Primus wrote: