converting 5" boot disk to 3"

[Todd Kelley]

I read the thread about creating new boot disks, but I would like to do
something slightly different.

Is there a way to convert a 5.25" boot disk into a 3.5" boot disk?
I am running ISC 2.2.1.

I tried copying the first cylinder of the 5" to the first cylinder of the 3",
then making a file system on the 3", but this didn't work.  Is the boot
block of a 3.5" disk very different from that of a 5.25" disk (because of
the difference in sectors per track)?

Todd Kelley (tgk at vis.toronto.edu)