Epson Apex 20020 - Manual (Page 195)

Select option 1 from the menu to start thistest. The program
displays the number of each cylinder it finds, counting down
from 614 (for a 20MB hard disk) to 0. The seek is performed by
the read/write heads simultaneously, so you see the cylinder
numbers only once. If no errors occur, the menu reappears.
Write, Read Check
This check tests the ability of the hard disk drive to read and
write data. The test writes to and reads from each sector of the
innermost cylinder of the disk, using each head.
Note
This test destroys all data on the innermost cylinder of the
selected hard disk drive. This cylinder is reserved for
diagnostics, and is never used for storage by MS-DOS.
Therefore, data created by MS-DOS is not destroyed.
Select option 2 from the menu to start this test. You see these
messages:
The data on the highest physical cylinder
may be destroyed by this check.
Enter Y to start this check.
Enter N to return to the menu.
Press Y and then Enter to continue with the test. You do not
see a cylinder count during the test. If no errors occur, the
program returns to the menu.
If an error is reported, make a note of the code and message.
Then use the Non-destructive surface analysis (option 4 on the
HARD DISK FORMAT MENU) to check the condition of the
hard disk. If this analysis shows no other problems with the
disk, follow these steps:
1. Back up all the files on your hard disk with the BACKUP
command, described in your MS-DOS Reference Manual.
Performing System Diagnostics C-31