Epson 3865X Plus - Manual (Page 284)

7. If you have been using your hard disk for a long time and
begin to see numerous read/write errors, the magnetic
signals on the disk may be getting weak. If this is the case,
you may need to reformat the hard disk. If you decide to do
this, follow these steps:
Back up all the data on the disk using COPY, XCOPY,
or BACKUP (described in the MS-DOS Reference
Manual).
Follow the instructions in Appendix C to perform a
low-level (physical) format.
Follow the instructions in the MS-DOS Installation
Guide to install MS-DOS on the hard disk.
8. If you have installed a hard disk drive made by another
company in your computer, you need to install MS-DOS.
See the MS-DOS Installation Guide for instructions. If the
hard disk needs a low-level format, do that before you
install MS-DOS. (See Appendix C for instructions.)
9. If you have installed a hard disk drive that has its controller
on an option card, you may need to change the position of
jumper J2 on the main system board. See “Changing the
Jumper Settings” in Chapter 5. Also, if your computer came
with a hard disk drive that you are no longer using, be sure
the cable leading from that drive to the main system board
and the hard disk drive power cable are disconnected.
Troubleshooting D-23