"I think that your limiting factor will be your computers BIOS."

Annu asked about converting a floppy drive; I doubt that would be possible, since a different head is needed to read the finer tracks at 1.44MB.

1.44MB drives are dirt cheap these days (under a tenner retail here in the UK) - why not just get a new drive?
(but then, of course, you might hit the software issues mentioned by Rob...)