Ok out of extensive research as I don't have a floppy drive in my powerbook G3 I tried my 1400c and per my suggestion don't use the drive anymore with the 1400c as it fried the motherboard with both drives I tried. Now I know why the 1400 series power area blows up. Glad I had two spares. FYI the floppies are the Mitsubishi units. When used in my 190 and 500 series they are fine. I guess it's too much load for the poor old 1400.

So the original question, the 1400 series drive is basically the same as the sony in the 190 and 500 and they write and read 800k so if you check what type from system profiler it should tell you what type of drive.