Epson Apex 20020 - Manual (Page 194)

Hard Disk Drives and Controller Check
Use this option to test the performance of the hard disk drive
installed in your computer. If any errors occur, have the drive
checked and serviced by your Customer Care Center.
When you select option 17 from the DEVICE LIST, you see
this menu:
HARD DISK DRIVE(S) AND CONTROLLER CHECK MENU
1 - Seek check
2 - Write, read check
3 - Head select check
4 - Error detection and correction check
5 - Read, verify check
6 - Run all above checks
0 - Exit
Enter selection number:
If you specify to run the hard disk drive check multiple times,
this menu does not appear and only the first three tests are
performed.
When you select a check from this menu, the program
determines the number of hard disk drives installed in your
computer. If you have more than one drive, each time you
select a test you see this prompt:
Check which drive (C/D)?
Press
C
or
D
and then
Enter.
Seek Check
This test checks the ability of the read/write heads to locate
any part of the hard disk. This action by a read/write head is
called a seek. During this test, each head seeks each cylinder of
the disk in sequence, starting from the center.