PURPOSE: To compensate/correct the rotary actuator arc of a direct access storage device(DASD) by changing the amplitude and phase of a reference feed forward correction signal which is formed in response to a discriminated specific selective track.
CONSTITUTION: A servo processor 52 transmits a control signal to DAC 54 which is combined to a current driver 56. The driver 56 supplies a control current to a rotary actuator 58 so as to move the transducer head 28 of a RAW channel 60. The detection position data indicated by a block 62 is combined to the servo processor 52. With a feed forward control block 64 combined to the servo processor 52, control information is obtained for the compensation/ correction of both amplitude and phase against change in a track number or radius, and also for compensation/correction of a pseudo sector. For the purpose of proper compensation of the feed forward signal to a file, both amplitude and phase for correction must be compensated against change in the track number or radius.
KEBIN JIYATSUKU ERIKUSON
HARU HARUMAA OTETSUSEN
| JPS60170070A | 1985-09-03 | |||
| JPH02501248A | 1990-04-26 | |||
| JPH03237667A | 1991-10-23 | |||
| JPS6015872A | 1985-01-26 | |||
| JPH02259915A | 1990-10-22 | |||
| JPH01107064U | 1989-07-19 | |||
| JPH04324173A | 1992-11-13 | |||
| JPH03216874A | 1991-09-24 | |||
| JPS63239621A | 1988-10-05 | |||
| JPS63108524A | 1988-05-13 | |||
| JPH0330158A | 1991-02-08 | |||
| JPH05128752A | 1993-05-25 | |||
| JPH05266616A | 1993-10-15 | |||
| JPH0520811A | 1993-01-29 | |||
| JPH056635A | 1993-01-14 | |||
| JPH04318376A | 1992-11-09 | |||
| JPH04274064A | 1992-09-30 |