Off-Line Read Scanning; Error Log; Self-Test - Hitachi HDS723020BLA642 Specifications

9.5.6

Off-line Read Scanning

The device provides the off-line read scanning feature with reallocation. This is the extension of the off-line data
collection capability. The device performs the entire read scan with reallocation for the marginal sectors to
prevent the user data lost.
If interrupted by the host during the read scanning, the device services the host command.
9.5.7

Error Log

Logging of reported errors is supported. The device provides information on the last five errors that the device
reported as described in SMART error log sector. The device may also provide additional vendor specific
information on these reported errors. The error log is not disabled when SMART is disabled. Disabling SMART
shall disable the delivering of error log information via the SMART READ LOG SECTOR command.
If a device receives a firmware modification, all error log data is discarded and the device error count for the life
of the device is reset to zero.
9.5.8

Self-test

The device provides the self-test features which are initiated by SMART Execute Off-line Immediate command.
The self-test checks the fault of the device, reports the test status in Device Attributes Data and stores the test
result in the SMART self-test log sector as described in SMART self-test log data structure. All SMART attributes
are updated accordingly during the execution of self-test.
If interrupted by the host during the self-tests, the device services the host command.
If the device receives a firmware modification, all self-test log data is discarded.
Hitachi hard disk drive specifications
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