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C141-E116-01EN4 - 2
4.2.2 Head
Figure 4.1 shows the read/write head structures. The Numerals 0 to 3 indicate read/write heads.
These heads are raised from the disk surface as the spindle motor approaches the rated rotation
speed.
Figure 4.1 Head structure
4.2.3 Spindle
The spindle consists of a disk stack assembly and spindle motor. The disk stack assembly is
activated by the direct drive sensor-less DC spindle motor, which has a speed of 7,200 rpm. The
spindle is controlled with detecting a PHASE signal generated by counter electromotive voltage of
the spindle motor at starting. After that, the rotational speed is kept with detecting a servo
information.
Spindle Actuator
MPG3307AH-E / MPG3409AH-E
3
2
1
0
MPG3204AH-E
Spindle Actuator
0
1