give /usr/ports/emulators/mtools a try :-) It also works for MSDOS ZIP disks.
While mtools is very useful in a lot of circumstances, and I use it a
fair bit, it's not as versatile as actually mounting the disk. As far
as I'm aware mtools cannot make a disk seem like it's mounted or act
directly on the disk's contents (with the possible exception of
When I'm looking through a 1gb jaz disk for a file containing
something, being able to see the names of files and copy them to
another disk isn't very useful.