Servo Frame Format - Fujitsu MHT2020AT Product Manual

Theory of Device Operation

4.7.3 Servo frame format

As the servo information, the IDD uses the two-phase servo generated from the
gray code and servo 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, gray code,
servo A to D, and PAD. Figure 4.8 shows the servo frame format.
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Figure 4.8 Servo frame format
C141-E192-01EN