Type FLUSH at the FLEX command line; or select Flush from the
File menu. This will rewrite the virtual disks back to the
Host OS immediately, if the disks have been changed. This
is a very good thing to do when you're about to test
something you don't have complete faith in.
Note that
this warmstarts FLEX, and because of this, you should not
flush the disks when running any application program.