Epson 386/25 - Manual (Page 242)

2. Type the number of the cylinder containing the bad track
and press
Enter. You see this prompt:
Enter head number (0 -nn):
3. Type the head number for the bad track and press Enter.
To cancel the operation, press Enter without typing a value.
When you complete a valid entry, it appears in the table and
you can add the next bad track, if necessary.
If you make a mistake, move the cursor block to the incorrect
track and press C to alter the track data or press D to remove the
track from the table. Change the track data just as you add a
track.
The maximum valid cylinder number and head number
(nnnn
and nn) vary according to the capacity of the hard disk. If you
enter an invalid cylinder or head number, a reminder of the
range of values appears and the program asks you to enter the
value again.
When you finish adding all the bad tracks, press Enter without
typing a value. After you complete editing, check the entries in
the defective track table. When you are sure the table is correct,
press F. The program displays a warning about the consequences
of proceeding with formatting.
C-8 Physically Formatting a Hard Disk