Fujitsu MAN3367FC Manual/User Guide - Page 114
W/R recovery
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Principle of Operation 4) Gray code area The gray code is an encoded area which includes the head number, servo sector number and cylinder information as gray code. Head position is recognized based on the cylinder information embedded as a gray code pattern. 5) Position area Information for recognizing head position is recorded in the position area. Head position in cylinder unit is recognized by using the cylinder information in the gray code area, and head position under one cylinder (resolution) is recognized by using the information in the position area. Outer side of disk Center of disk DS IGB DSaetravozoznoene Figure 8.5 Position of servo track OGB 8.7.3 Servo frame format W/R recovery Servo Gap mark Gray code/Position Gap Figure 8.6 Servo frame 8.7.4 Spindle motor control The MPU controls the senseless 3-phase spindle motor. It carries out start / normal rotation control and spindle synch control. (1) Activation The MPU carries out control of the spindle motor from the stopped condition to normal rotation by the following sequence. 1) DSP intermittently supplies current between specific phases (e.g., phases U and V) to force a fixed motor rotation position. This operation is called alignment. 8-12 C141-E133-02EN
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