Fujitsu MBA3073NC Product Manual - Page 100

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 (ROM) • Data buffer b. Seek test This test checks the positioning operation of the HDD using several seek modes (2 points seek, 1 position sequential seek, etc.). The positioning operation is regarded as success when the seek operation to the target cylinder is completed. c. Write/read test This test checks the write/read function by using the Internal test space of the HDD. (1) Initial self-diagnostics When power is turned on, the HDD 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 HDD blinks (at 0.4-second intervals). In this status, the HDD 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 initiator should issue the REQUEST SENSE command. The sense data obtained with the REQUEST SENSE command details the error information detected with the initial selfdiagnostics. 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 HDD executes the initial self-diagnosis again. 96 Downloaded from www.Manualslib.com manuals search engine C141-E270