Epson Apex 20020 - Manual (Page 218)

8.
Press any key to restart the system (the MS-DOS Startup
diskette is already in drive A). Your computer reloads
MS-DOS, displaying the preliminary copyright information
and the date prompt.
9.
Press
Enter
twice to accept the date and time shown.
The system now recognizes the MS-DOS partition as drive C
and the extended partition as drive D. To install MS-DOS on
your hard disk, you must format these logical drives.
Formatting the Primary Partition
Use the MS-DOS SELECT command to format the primary
partition, drive C. SELECT automatically does the following:
Formats the partition
Labels the partition
Copies the MS-DOS system files to the hard disk.
After you have done this, MS-DOS boots automatically from
this partition on the hard disk every time you turn on or reset
your computer (as long as there is no diskette in drive A).
Follow these steps to format the primary partition:
1. Insert the working copy of your MS-DOS Startup diskette
in drive A (if it is not there already), and turn on the
computer if necessary.
2. At the A> prompt, type the following and press
Enter:
SELECT A: C:\DOS 001 US