 This is a 3 and a half inch HD floppy disk that has been formatted as a Mac 800k I did that by tricking it by taping over the hole over here and I put this in the power book 180 and formatted it. Thank you for the power book 180. It's 800k because 800k floppies are kind of interesting and I've been trying to read this on some standard PC Sony or Panasonic 3 and a half inch floppy disk drive but what's interesting is it doesn't really work here get it with flux engine you can see the dots are sectors that read fine and you see like as you get to higher and higher tracks you know the sectors don't show up and it's like they're okay for like the first few tracks but then they disappear. Well the reason for that is actually kind of interesting Mac 800k floppies are weird. Each track actually has a different number of sectors and the pulse widths change so on the outer track which is actually track zero the pulses are very short and as they get closer and closer to the center near the hub the pulses get wider because you want more magnetic media to pass under the head and for MFM floppies which is what normal IBM floppies are for floppy disks the track widths sorry the bit widths don't change they're like two four six microseconds and they're the same no matter what track they're on whether they're on track zero all the way out here or track 80 all the way in here so if we're trying to read Mac format floppies the outer tracks will read just fine because they use the short bit widths but as the bit widths get larger in time but stay the same in physical space these disk drives have trouble reading them so we might have to do some special math to get Mac 800k floppies to work with this but also be the disk itself more to come