Fujitsu MHU2100AT 用户手册

 

C141-E202-01EN 4-17 

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. 

 

(1) Write/read recovery 

This area is used to absorb the write/read transient and to stabilize the AGC. 

(2) Servo mark 

This area generates a timing for demodulating the gray code and position-
demodulating the servo A to D by detecting the servo mark. 

(3)  Gray code (including sector address bits)  

This area is used as cylinder address.  The data in this area is converted into the 
binary data by the gray code demodulation circuit 

(4)  Servo A, servo B, servo C, servo D 

This area is used as position signals between tracks and the IDD control at on-
track so that servo A level equals to servo B level. 

(5) PAD 

This area is used as a gap between servo and data.