Epson EL 486UC - Manual (Page 110)

You are unable to store data on the hard disk drive.
Make sure you have partitioned and formatted the drive
correctly for your operating system. Use the procedures
provided in your operating system manual.
Also, make sure your hard disk drive has been physically
formatted by the manufacturer. (All Epson-supplied drives are
physically formatted at the factory.) If it has not been physically
formatted, use the format utility that came with the drive to
format it.
Note that a physical format is different from software-based
formatting commands, such as the 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.
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 or Epson Direct.
Password Problems
You have forgotten your password.
As your system performs its power-on diagnostics, it displays a
part number, prefaced by the letters “P/N” after the SEIKO
EPSON CORP heading. Enter the first six digits of this number
at the password prompt. You see the message,
OK
!,
followed
by the operating system prompt. The password option within
the SETUP program is now set to
Not
set.
Troubleshooting 6-9