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5.4 Checking Operation after Installation and Preparing the HDD for Use
C141-E235 5-5
5.4 Checking Operation after Installation and Preparing the HDD for Use
5.4.1 Checking initial operation
This section explains how to check operation after power is turned on. Since the initial operation of
an HDD differs depending on the settings of the motor start mode, check the following initial
operations according to the motor start mode set during installation.
(1) Initial operation if the settings have been specified so that turning power on automatically starts
rotating the motor
a) When power is turned on, the Active LED blinks and the HDD starts the initial self-diagnosis.
b) If the initial self-diagnosis detects a problem, the HDD sends the Fault LED Out signal to the
interface connector, as specified by SFF8045.
Remark: The spindle motor may or may not start rotating in this stage.
c) If the HDD is in idle mode, the Active LED remains lit. (When the initiator accesses the HDD,
the LED goes off and then goes on again at the end of the processing requested by the initiator.)
(2) Initial operation if the settings have been specified so that the START/STOP UNIT command is used
to start rotating the motor
a) When power is turned on, the Active LED goes on momentarily and the HDD starts the initial
self-diagnosis.
b) If the initial self-diagnosis detects a problem, the HDD sends the Fault LED Out signal to the
interface connector, as specified by SFF8045.
c) The spindle motor does not rotate until the START/STOP UNIT command is received. The
initiator is required to use the procedure described in Section 5.4.2 to send the START/STOP
UNIT command.
d) About 60 seconds after the START/STOP UNIT command is received, the disk drive enters the
READY state. The HDD then starts reading system information from the system space on disks.
e) The Active LED goes off while the command is being executed.
(3) Take the following actions if a problem occurs:
a) Check if all cables are correctly connected.
b) Check if the power supply voltage is correct. (Measure the voltage at the power connector on the
HDD.)
c) Continuous sending of the Fault LED Out signal to the interface connector indicates the initial
self-diagnosis has detected a problem. In this event and if the situation allows, sense data should
be obtained by issuing the REQEUST SENSE command from the initiator (host system). Sense
data is information required for troubleshooting.