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2 head, 3 spindle – FUJITSU MPG3XXXAH-E User Manual

Page 49

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C141-E116-01EN

4 - 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.

S p i n d l e

A c t u a t o r

MPG3307AH-E / MPG3409AH-E

3

2

1

0

MPG3204AH-E

S p i n d l e

A c t u a t o r

0

1