Fujitsu MPG3XXXAT manual Servo frame format, Servo frames in each track

4.7.3Servo frame format

As the servo information, the drive uses the two-phase servo generated from the gray code and Pos A to D. This servo information is used for positioning operation of radius direction and position detection of circumstance direction.

The servo frame consists of 6 blocks; write/read recovery, servo mark, preamble, gray code, Pos A to D and PAD. Figure 4.6 shows the servo frame format.

0.16μs		0.17μs						0.80μs
0.72μs	1.81 μs		0.53μs	0.74μs	0.56μs	0.56μs	0.56μs

PA SCD PosA PosB PosC PosD PAD

ASMSSM

R/W Recovery Field

6.63μs

Servo	DATA	DATA	Servo	DATA
Frame			Frame

88.18 μs

Figure 4.6 126 Servo frames in each track

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