Epson Y16499100301 - Manual (Page 126)

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, consult your dealer.
Error detection and correction check
This test checks the ability of the hard disk drive to detect
a read/write error and to correct the data accordingly.
Note
This test destroys some data on the innermost cylinder of the
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 3 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. If no errors
occur, the menu is displayed.
An error occurs only if the drive is malfunctioning. In this
case, back up all your files and have the drive serviced
immediately. (The drive may be corrupting your data.)
Read, verify check
This test reads and verifies data from all tracks of the disk,
checking each cylinder and using both heads.
Select option 4 from the menu to start this test. The
program displays the number of each cylinder it finds. For
example, with a 20MB hard disk, the first message you see is:
Current cylinder is 614
D-22 Performing System Diagnostics