Emax

Hi all, I'm new on this group.
I have a problem with emx program: after have
formatted a DS/DD disk with this utility, when
he try to write the OS on disk give me the
error "Address mark not found!" and exit.
The same thing if I try to write a bank on
disk...
I use a Pentium PC with DOS 6.22.
Anyone can help me?
Many thanx.

Roberto