7.5 Drive Self-Test (DST)
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7.5.3 Matters that are common to both modes During a self-test, the INIT can obtain the progress of the self-test by referencing
the "sense key specific information" field (bytes 16-17), which is returned in
response to the REQUEST SENSE command. When the self-test has encountered
no error, the HDD terminates the command with CHECK CONDITION status
(NOT READY [=2]/LOGICAL UNIT NOT READY, SELF-TEST IN
PROGRESS [04-09]).
If the current test segment encounters an unrecoverable error during a self-test, the
HDD updates the self-test result log page and terminates the self-test in progress.
(If a recoverable error is detected during a self-test, the self-test result log page is
not updated and the self-test in progress continues.)
The INIT can reference the self-test result log page to obtain information on the
previous 20 self-tests that have been completed.
7.5.4 Short self-test A short self-test is divided into several test segments, each of which is conducted
as a simple test.
7.5.5 Extended self-test An extended self-test is conducted for all test segments that are defined on the
HDD. Each segment test is always initiated, beginning with sub-segment number
1.
The test execution time is reported using bytes 10-11 on the control mode page
(PageCode = 0A) described in Section 5.1.7.
7.5.6 Test segments The test items included in each test segment are explained below.
a. Buffer RAM test
This test segment performs write/read/compare checking of the data buffer
area.
Increment, decrement, and single patterns are used as the data patterns. The
single pattern is a data pattern consisting of "00h." For each sub-segment,
these three types of patterns are used.
If a compare error is detected during the data compare check phase, Hardware
Error [=4]/Buffer RAM Compare Error/Bus Error [40-81] (Reason code =
'00h' for the single pattern, '01h' for the increment pattern, or '02h' for the
decrement pattern) is reported on the self-test result log page.