HGST Ultrastar 7K4000 (SAS) Hard Disk Drive Specification
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Tests performed in the Short and Extended Self-test
The following table defines the tests performed in the short and extended self test. They are defined by their segment number
which is also used to report Self-Test Results, in
Log Sense Page 10. Note that the only difference between the Short and the
Extended tests, is the sequential verify test in segment 7h. Also note that either of these tests can be run in foreground or back-
ground mode as previously described.
Table 238: Short and Extended Self-Test Description
20.12.2.4 Background Medium Scan
For a related function, see .Mode Page 1C (Informational Exceptions Control).
Segment
Number
Short Self-
Test
Extended
Self-Test
Test Description
1h Drive Ready Test Internal check to insure drive is “ready”, similar to a Test
Unit Ready command.
2h Drive Diagnostics This test is comprised of the Default Self Test as defined
in Section 20.12.2.1, “Default Self-test” on page 297
3h SMART Perform SMART testing and check results to ensure that
SMART threshold criteria are not exceeded
4h Low Level Format check Check to insure that the media is currently not in the
MEDIA FORMAT CORRUPTED state.
5h Physical Head Check Write/Read test on each head in a predefined location in
the drive's Reserved Area of the disk.
6h Random Verify Perform 4000 random verify operations and insure no
uncorrectable errors.
7h - Verify First
300MB
- Verify Last
100 MB
Verify all
LBA’s
Sequential verify operation. Ensure that no uncorrect-
able errors occur within the verify range.
8h Recheck SMART Same as segment 4h.
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