Epson Apex 20020 - Manual (Page 71)

To secure the read/write heads for moving, run the HDSIT
program. Follow these steps to run HDSIT:
1. Exit any program you are using so the MS-DOS command
prompt is on the screen,
2. Insert the Reference diskette in drive A.
3. Type the following and press Enter:
A:HDSIT
You see a message on the screen that tells you the disk drive’s
read/write heads will remain locked until you reset the
computer or turn the power off and on again. The computer
locks the heads and disables the keyboard. You can now turn
off the computer and prepare to move it to the new location.
Using Your Computer 3-19