Fujitsu MHV2080BH User Manual

4-6 

C141-E224 

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 drive becomes ready.  The host can issue commands. 

f)  The disk drive executes self -calibration.  This collects data for VCM torque 

and mechanical external forces applied to the actuator, and updates the 
calibrating value. 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Start 

Self-diagnosis 1 

- MPU bus test 
- Internal register 
  write/read test 
- Work RAM write/read 
  test 

Power-on 

a) 

The spindle motor starts.

Self-diagnosis 2 

- Data buffer write/read 

 test 

b) 

Confirming spindle motor

speed 

c) 

Load the head assembly

Drive ready state 

(command waiting state) 

f) 

Execute self-calibration 

e) 

Initial on-track and read 

out of system information 

d) 

End