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4.7.3 Servo 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.
Figure 4.6 126 Servo frames in each track
0.72
µ
s
1.81
µ
s
ASM SSM
SCD PosA PosB PosC PosD PAD
R/W Recover
y
Field
6.63
µ
s
DATA
DATA DATA
88.18
µ
s
Servo
Frame
Servo
Frame
0.16
µ
s
0.17
µ
s
0.53
µ
s
0.74
µ
s 0.56
µ
s 0.56
µ
s 0.56
µ
s
0.80
µ
s
PA