7 servo control – FUJITSU MPB3052AT User Manual
Page 58
C141-E045-02EN
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Table 4.3
Write clock frequency and transfer rate of each zone
Zone
0
1
2
3
4
5
6
7
Cylinder
0
to
660
661
to
1197
1198
to
1938
1939
to
2672
2673
to
3332
3333
to
3958
3959
to
4747
4748
to
5216
Transfer rate
[MB/s]
16.71
16.35
15.82
15.18
14.68
14.15
13.44
13.06
Zone
8
9
10
11
12
13
Cylinder
5217
to
5886
5887
to
6505
6506
to
7073
7074
to
8286
8287
to
8718
8719
to
8982
Transfer rate
[MB/s]
12.44
11.85
11.33
10.04
9.74
9.58
The MPU transfers the data transfer rate setup data (SDATA/SCLK) to the RDC that includes
the time base generator circuit to change the data transfer rate.
4.7
Servo Control
The actuator motor and the spindle motor are submitted to servo control. The actuator motor
is controlled for moving and positioning the head to the track containing the desired data. To
turn the disk at a constant velocity, the actuator motor is controlled according to the servo data
that is written on the data side beforehand.