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4 synthesizer circuit – FUJITSU MPG3XXXAH-E User Manual

Page 59

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C141-E116-01EN

4 - 12

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.

Table 4.1

Transfer rate of each zone

MPG3307AH-E

Zone

0

1

2

3

4

5

6

7

Cylinder

0

to

2207

2208

to

4223

4224

to

7231

7232

to

9823

9824

to

13119

13120

to

15615

15616

to

17087

17088

to

19359

Transfer rate
[MB/s]

49.73

48.87

47.22

45.79

43.61

41.88

41.01

39.28

Zone

8

9

10

11

12

13

14

Cylinder

19360

to

22047

22048

to

23839

23840

to

25247

25248

to

26591

26592

to

28767

28768

to

30175

30176

to

30783

Transfer rate
[MB/s]

37.22

35.77

34.62

33.45

31.43

30.12

27.92

MPG3204AH-E / MPG3409AH-E

Zone

0

1

2

3

4

5

6

7

Cylinder

0

to

2783

2784

to

5567

5568

to

8351

8352

to

11263

11264

to

13439

13440

to

16095

16096

to

17983

17984

to

19839

Transfer rate
[MB/s]

60.71

60.71

60.71

60.71

59.22

56.86

54.90

52.94

Zone

8

9

10

11

12

13

14

Cylinder

19840

to

22175

22176

to

23583

23584

to

25087

25088

to

26719

26720

to

28575

28576

to

29951

29952

to

30783

Transfer rate
[MB/s]

50.35

48.82

47.06

45.10

42.75

40.94

38.04

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.