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Theory of Device Operation 
 
4-6 
C141-E224 
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 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. 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Figure 4.3  Power-on operation sequence 
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