Epson Apex, User Manual

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Destructive surface analysis
Use this option to accurately locate any bad tracks on a hard
disk, and to flag any bad tracks that are not flagged.
WARNING
If any errors occur during this check, all data on the track that
produces the error is destroyed. For this reason, if you think that
an unflagged bad track is causing trouble, first run option 4,
Non-destructive surface analysis, to check the disk surface.
This test operates by a complex process of writing, reading, and
verifying information on every track of the hard disk, except for
tracks that are already flagged as bad tracks.
To start the test, press 3 and then Enter. You see these
messages:
Analyze Hard Disk
Read/Save/Write/Read/Restore/Read
check for all tracks...
Current cylinder is xxxx
As each track is checked, the cylinder number (xxxx) counts
down to zero. When the analysis is complete, the program
displays a complete report on the status of the disk, including a
table of unflagged tracks that produced write, read errors. For a
20MB hard disk with one unflagged bad track, you see this
display:
Analysis finished.
Count of tracks flagged bad
= 1
Count of tracks with write, read errors=0
Count of good tracks =2459
No write,
read error was detected.
No data was destroyed.
Press ENTER to return to the menu.