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4.6.4
Synthesizer circuit
The drive uses constant density recording to increase total capacity. This is different from the
conventional method of recording data with a fixed data transfer rate at all data area. In the
constant density recording method, data area is divided into zones by radius and the data
transfer rate is set so that the recording density of the inner cylinder of each zone is nearly
constant. The drive divides data area into 15 zones to set the data transfer rate. Table 4.2
describes the data transfer rate and recording density (BPI) of each zone.
Table 4.2
Zone
0
Cylinder
0
to
964
Transfer rate
34.44
[MB/s]
Zone
8
Cylinder
11211
to
12170
Transfer rate
27.68
[MB/s]
The MPU transfers the data transfer rate setup data to the RDC that includes synthesizer 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.
4 - 12
Write clock frequency and transfer rate of each zone
1
2
3
965
2151
3581
to
to
to
2150
3580
4790
34.44
34.44
34.44
9
10
11
12171
12591
13431
to
to
to
12590
13430
14430
27.14
26.10
24.80
C141-E093-01EN
4
5
6
4791
6121
8031
to
to
to
6120
8030
9440
33.41
31.83
30.59
12
13
14
14431
15861
16661
to
to
to
15860
16660
17300
22.96
21.93
20.36
7
9441
to
11210
28.71
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