🚀 go-pugleaf

While the difference in coercivity is large for 5.25 inch disks, about
a factor of two if I recall correctly, the difference is on the order
of 10 % for 3.5 inch disks. I suspect that is within manufacturing
tolerances! 

If you try to format a 360 K to 1.2 M, you will get lots of bad blocks,
almost all on the inner tracks. If you try to format 720 K as 1.44, you
will get good disks. That is my experience and the experience of
everybody I know who has tried it.

	Mark

PS I find that my swiss army knife makes an adequate 720K to 1.44M
disk converter. Of course I consider my swiss army knife to be the
ultimate tool!