Epson 4000 - Manual (Page 111)

Note that a physical format is different from software-based
formatting commands, such as the MS-DOS FORMAT
command.
You
have
been using your
hard
disk drive successfully for
some time but notice a reduction in
performance.
The data on the disk may have become fragmented. Back up all
your data and use a disk compaction utility to reorganize the
files on your disk.
Check that your IDE drivers are installed correctly (see
Chapter 6). Make sure your CONFIG.SYS has not been altered
and that it loads the IDE drivers.
If you cannot access data on your hard disk or you are seeing
read/write errors, the disk may have a physical problem.
Contact your service representative.
Password Problems
You hove
forgotten
your password.
You must discharge your CMOS memory. To do this, you
need to change the setting of jumper J34 to position 3-4. See
Chapter 4 for details on changing the jumper.
When you turn the computer back on after changing J34, the
SETUP values are reset to their factory defaults. Both the
Supervisor and the User passwords are disabled.
Be sure to turn off the computer and set J34 back to 2-3 before
you start work.
Troubleshooting 7-9