Epson CW3S16 Operation Manual page 205

After inserting a formatted diskette in the drive, and pressing
<ENTER > , the message box will contain the following
message:
In the upper portion of the activity box, "Read," "Write," and
"Verify" will flash in sequence as these operations are
performed. In the Status portion of the Activity box, the
cylinder numbers, head numbers, and sector numbers will be
read, written, and verified.
Note
To abort the test, hit < ESC >
'When the test has been aborted or completed, press
< ENTER > to return to the main menu.
Sequential Read/Write Test
This test performs a sequential read/write operation, checking
the sequential seek, read, and write capability of the drive. The
diskette used in this test must be formatted under the user's
operating system before running the test.
Warning!
This test is a destructive operation. This means that the
data on the diskette required to perform these tests will be
destroyed. When performing these operations, be certain
that the formatted diskettes required for these tests does not
contain valuable information which cannot be recovered
from the hard disk or from another diskette.
E-42 Advanced ROM Diagnostics