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6-4 C141-E230
b) When an error is detected in the hardware function test, the HDDs post the CHECK
CONDITION status for all I/O operation request except the REQUEST SENSE command.
The error status is not cleared even if the error information (sense data) is read. Only when
the power is turned off or re-turned on, the status can be cleared. When this status is
cleared, the HDDs execute the initial self-diagnostics again (see item (1)).
Refer to Subsection 4.4.1 “SEND DIAGNOSTIC (1D)” of the Interface Specifications for further
details of the command specifications.
6.1.2 Test programs
The basic operations of the HDD themselves itself can be checked with the self-diagnostic function.
However, to check general operations such as the host system and interface operations in a status
similar to the normal operation status, a test program that runs on the host system must be used.
The structure and functions of the test program depend on the user system requirements. Generally,
it is recommended to provide a general input/output test program that includes devices connected to
the input/output devices on other I/O ports.
Including the following test items in the test program is recommended to test the HDD functions
generally.
(1) Interface test
The operations of the data buffer on the HDDs are checked with the WRITE BUFFER and READ
BUFFER commands.
(2) Basic operation test
The basic operations of the HDDs are checked by executing self-diagnosis with the SEND
DIAGNOSTIC command (see Subsection 6.1.1).
(3) Random/sequential read test
The positioning (seek) operation and read operation are tested in random access and sequential
access modes with the READ, READ EXTENDED, or VERIFY command.