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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 4.1 describes the data
transfer rate and recording density (BPI) of each zone.
Zone
0
Cylinder
0
to
1215
Transfer rate
50.82
[MB/s]
Zone
8
Cylinder
10816
to
12351
Transfer rate
41.76
[MB/s]
The MPU transfers the data transfer rate setup data 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.
4 - 12
Table 4.1
Transfer rate of each zone
1
2
3
1216
2432
3744
to
to
to
2431
3743
4831
50.82
50.82
50.20
9
10
11
12352
13952
15232
to
to
to
13951
15231
16287
39.53
37.65
36.08
C141-E112-01EN
4
5
6
4832
5824
7744
to
to
to
5823
7743
9631
49.41
47.45
45.49
12
13
14
16288
17824
19072
to
to
to
17823
19071
19423
33.73
31.76
29.65
7
9632
to
10815
43.92
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