Epson 20 - Read, Verify Check

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 occurs, 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.
2. Re-format the disk using option 2, Format hard disk, on the
OPERATION MENU.
3. Recreate the MS-DOS partition with FDISK and format it with
SELECT (See Chapter 3.)
4. Restore your files.
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Read, Verify Check
This test reads and verifies data from all tracks of the disk, checking
each cylinder and using all read/write heads.
Select option 3 from the menu to start this test. The program displays
the number of each cylinder it finds. For example, with a hard disk,
the first message you see is:
Current cylinder is nnn
C-28 Performing System Diagnostics