Epson Apex 20020 - Manual (Page 186)

Before any checks are performed, the program determines the
number of diskette drives installed in your computer. If you
have more than one drive, you see this prompt each time you
select a test:
Check which drive (A/B)?
Press
A
or
B
and then
Enter.
If any errors occur, record the error code and message and
contact your Epson Customer Care Center.
Sequential Seek Check
This test checks the ability of the read/write heads to locate
any part of the diskette. This action by a read/write head is
called a seek. During this test, each head seeks sequentially
from the innermost track to the outermost track. The
innermost track is track 39 for 36OKB diskettes and track 79 for
720KB, 1.2MB, and 1.44MB diskettes.
Select option 1 from the menu to start this test. The program
displays the number of each track it finds. For example, with a
360KB diskette, the first message you see is:
Current track is 39
The program counts the track numbers from 79 or 39 to 0. The
seek is performed by each head, so you see the count twice. If
no errors occur, the menu reappears.
Random Seek Check
This test is identical to the sequential seek check, except that
the seek operation is performed on each track in random order
instead of sequential order. Select option 2 from the menu to
start this test.