Hitachi Travelstar 2.5 inch SATA HTS722020K9A300 Oem Specification page 143

Off-line mode: The device executes command completion before executing the specified routine.
During execution of the routine the device will not set BSY nor clear DRDY. If the device is in the
process of performing its routine and is interrupted by a new command from the host, the device will
abort or suspend its routine and service the host within two seconds after receipt of the new
command. After servicing the interrupting command, the device will resume its routine
automatically or not start its routine depending on the interrupting command.
Captive mode: When executing self-test in captive mode, the device sets BSY to one and executes the
specified self-test routine after receipt of the command. At the end of the routine, the device sets the
execution result in the Self-test execution status byte and ATA registers as below and executes
command completion.
Status Set ERR to one when self-test has failed
Error Set ABRT to one when self-test has failed
LBA Mid Set to F4h when self-test has failed
Set to 2Ch when self-test has failed
LBA High
SMART Selective self-test routine
When the value in the LBA Low register is 4 or 132, the Selective self-test routine shall be
performed. This self-test routine shall include the initial tests performed by the Extended self-test
routine plus a selectable read scan. The host shall not write the Selective self-test log while the
execution of a Selective self-test command is in progress.
The user may choose to do read scan only on specific areas of the media. To do this, user shall set the
test spans desired in the Selective self-test log and set the flags in the Feature flags field of the
Selective self-test log to indicate do not perform off-line scan. In this case, the test spans defined
shall be read scanned in their entirety. The Selective self-test log is updated as the self-test proceeds
indicating test progress. When all specified test spans have been completed, the test is terminated
and the appropriate self-test execution status is reported in the S.M.A.R.T. READ DATA response
depending on the occurrence of errors. The following figure shows an example of a Selective selftest
definition with three test spans defined. In this example, the test terminates when all three test
spans have been scanned.
Figure 10 Selective self-test test span example
After the scan of the selected spans described above, a user may wish to have the rest of media read
scanned as an off-line scan. In this case, the user shall set the flag to enable off-line scan in addition
to the other settings. If an error occurs during the scanning of the test spans, the error is reported in
the self-test execution status in the S.M.A.R.T. READ DATA response and the off-line scan is not
executed. When the test spans defined have been scanned, the device shall then set the offline scan
pending and active flags in the Selective self-test log to one, the span under test to a value greater
than five, the self-test execution status in the S.M.A.R.T. READ DATA response to 00h, set a value
of 03h in the off-line data collection status in the S.M.A.R.T. READ DATA response and shall
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