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6-2 C141-E166
Brief test contents of self-diagnostics are as follows.
a. Hardware function test
This test checks the basic operation of the controller section, and contains following test.
• RAM (microcode is stored)
• Peripheral circuits of microprocessor (MPU)
• Memory (RAM)
• Data buffer
b. Seek test
This test checks the positioning operation of the disk drive using several seek modes (2 points
seek, 1 position sequential seek, etc.). The positioning operation is checked with confirming
the physical address information by reading the ID field (LBA) from the data block on track 0
after completion of the seek operation to the target cylinder.
c. Write/read test
This test checks the write/read function by using the Internal test space of the disk drive.
(1) Initial self-diagnostics
When power is turned on, the IDD starts initial self-diagnostics. The initial self-diagnostics checks
the basic operations of the hardware functions.
If an error is detected in the initial self-diagnostics, the LED on the drive front panel blinks. In this
status, the IDD posts the CHECK CONDITION status to all I/O operation requests other than the
REQUEST SENSE command. When the CHECK CONDITION status is posted, the INIT should
issue the REQUEST SENSE command. The sense data obtained with the REQUEST SENSE
command details the error information detected with the initial self-diagnostics.
Even if CHECK CONDITION status and sense data are posted, the LED continues blinking. Only
when the power is turned off or re-turned on, this status can be cleared. When this status is
cleared, the IDD executes the initial self-diagnosis again.