Epson EL 3S/33 - Manual (Page 92)

Also, make sure your hard disk drive has been physically
formatted by the manufacturer. 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 dealer.
Software Problems
The application program does not start.
Check that you are following the correct procedure for starting
the program and that it is installed correctly. If you do not have
a hard disk, make sure the correct diskette is in the diskette
drive.
The application program is having trouble reading a key
disk.
You may be running an application that requires a slower
processor speed. See Chapter 2 for information on setting the
processor speed.
6-8 Troubleshooting