time stamps on floppy drive files...

The modified times on my files change when I copy them
from the hard drive to the floppy using the xcopy command
in a batch program. The times are about 2 seconds later
on the floppy drive than they were on the hard drive.
This creates havoc with file backup schemes. The files
in my destination drive(floppy drive) now appear to have
been modified at a later time than the files in my source
drive(hard drive) from which I copied them. I need the
files in my destination drive to be in synch, to the
second, with the files in my source drive.

Any ideas on a fix or a workaround will be most helpful.