Epson 3865X Plus User Manual page 101

If you inserted the Reference diskette to run the AFDD
program, remove it now.
If you want to change the drive assignments, press S. The
system reboots and loads MS-DOS, and the new drive
assignments take effect.
If you do not want to change the drive assignments, press any
other key.
If you are running the AFDD program from a hard disk, you can
reassign the drives without viewing the message. Type the
following command and press
AFDD /S
The / S switch tells the AFDD program to reset the computer
and change the diskette drive assignments without displaying
the message.
Enter:
Enhancing System Operations
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