Fujitsu MHT2060BH, MHT2040BH, MHT2080BH manual Power-on Sequence, Power-on operation sequence

Theory of Device Operation

4.4 Power-on Sequence

Figure 4.3 describes the operation sequence of the disk drive at power-on. The outline is described below.

a)After the power is turned on, the disk drive executes the MPU bus test, internal register read/write test, and work RAM read/write test. When the self-diagnosis terminates successfully, the disk drive starts the spindle motor.

b)The disk drive executes self-diagnosis (data buffer read/write test) after enabling response to the SATA interface.

c)After confirming that the spindle motor has reached rated speed, the head assembly is loaded on the disk.

d)The disk drive positions the heads onto the SA area and reads out the system information.

e)The disk drive sets up a requirement for execution of self -calibration. This collects data for VCM torque and mechanical external forces applied to the actuator, and updates the calibrating value.

f)The drive becomes ready. The host can issue commands.

Power-on		Start
a)
	Self-diagnosis 1
	- MPU bus test
	- Internal register
	write/read test
	- Work RAM write/read
	test
	The spindle motor starts.
b)
	Self-diagnosis 2
	- Data buffer write/read
	test
c)
	Confirming spindle motor
	speed
	Load the head assembly

d)

e)

f)

Initial on-track and read out of system information

Execute self-calibration

Drive ready state (command waiting state)

End

Figure 4.3 Power-on operation sequence

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