Epson 20 - Manual (Page 173)

The cylinder number counts down to 0. At the end of the test, you
see a table of the results of the test. For example, for a hard disk with
no bad tracks, you see:
BAD TRACKS . . . . . . . . . . . . . . . . . . . . .
n
READ ERROR TRACKS . . . . . . . . . . . . . .
n
GOOD TRACKS . . . . . . . . . . . . . . . . . . . .
nnnn
Press ENTER to return to the menu
Press Enter when you have viewed the table. If the results show any
read error tracks, run the write/read test (described above), and
follow the instructions there.
Run All Above Tests
To run all the tests on the menu in sequence, press 4 and then Enter.
When you choose this option, all checks for the hard disk drives and
controller are performed automatically in sequential order. Although
you do not start each test, you must still supply the appropriate
responses to progress from one test to the next. The first prompt you
see is:
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.
Performing System Diagnostics C-29