公开(公告)号：JPH05303827A

公开(公告)日：1993-11-16

申请号：JP9988992

申请日：1992-04-20

Applicant: IBM

Inventor： YAMAMOTO SATOSHI ,  UEDA TETSUO ,  YONEDA ISAO

IPC: G11B21/08 ,  G11B5/55 ,  G11B19/04 ,  G11B21/10 ,  G11B19/28 ,  G11B19/00

Abstract: PURPOSE: To reduce a noise during seeking and to reduce power consumption. CONSTITUTION: Whether or not a moving speed of a head 1 is within the prescribed range containing a target speed during form the point of time arriving at the target speed to the point of time of prescribed deceleration start is decided by an MPU 8. As the result of having decided, when decided in the affirmative, a current flowing through a voice coil motor 2 is interrupted by a motor driver 11, and when negatively decided, the current is supplied through the voice coil motor 2 by the motor driver 11.

公开(公告)号：JPH05298841A

公开(公告)日：1993-11-12

申请号：JP9988892

申请日：1992-04-20

Applicant: IBM

Inventor： YAMAMOTO SATOSHI ,  YONEDA ISAO ,  SHINJO AKIRA

IPC: G11B21/10 ,  G11B5/55 ,  G11B5/596

Abstract: PURPOSE: To reduce power consumption by thinning out and using servo information at an idle time in a magnetic disk device of a sector servo method head positioning controlling, based on the servo information arranged on respective sectors. CONSTITUTION: In an idle state, the servo information of all the sectors are not used, and the servo information is selected every one sector or two sectors or above, and the head is position controlled only by the irreducible minimum servo information. Then, the power consumption required for calculating position control is reduced, and further, the power source of useless electric circuits in a write-in or read-out system and a servo system are made possible to be turned off. Specifically, when an MPU 35 detects the processing end of the commands of the write-in or the read-out receiving from a host computer 53, sends a parameter showing the idle state to a servo digital data processing circuit 31, when a next command does not arrive at an interface 51 from the computer 53 and generates a power control signal PWPS based on the servo information from the circuit 31.

公开(公告)号：JP2000137960A

公开(公告)日：2000-05-16

申请号：JP30892398

申请日：1998-10-29

Applicant: IBM

Inventor： KAGAMI NAOYUKI ,  TOKIZONO AKIRA ,  MUTUTANBII SURIIJAYANTA ,  SAKAI TATSUYA ,  YONEDA ISAO ,  HIEN FUU DAN ,  ARN SHARMA

IPC: G11B21/10 ,  G11B5/55 ,  G11B5/56 ,  G11B19/28 ,  H03H17/02 ,  G11B19/247

Abstract: PROBLEM TO BE SOLVED: To effectively perform disturbance suppression, mechanical resonance suppression by providing plural filter means and constituting the filter means in multistage with a parallel or serial form for a position control output with instructions of an MPU when an actuator is position controlled. SOLUTION: A servo control part SV 21 receives a signal from a servo pattern of a magnetic disk 1 to process it, and generates a servo signal output DACOUT moving a head arm 3 through a hardware sequencer SA 23 to send it to a voice coil motor VCM drive part 6. The SA 23 consists of plural digital filters, and sets arrangement of respective digital filters for the servo signal output DACOUT based on the instructions from the MPU 40. For instance, peak filters are arranged serially, and a peak is given to an output gain at a required frequency. Or, notch filters are arranged parallel, and the output gain suppressing the mechanical resonance is obtained.

公开(公告)号：JP2000048509A

公开(公告)日：2000-02-18

申请号：JP20168399

申请日：1999-07-15

Applicant: IBM

Inventor： SURI MUSHUZAMBI SURIIJAYANZA ,  ARN SHARMA ,  HEIN HUGH DAN ,  KAGAMI NAOYUKI ,  NAKAGAWA YUZO ,  TOKIZONO AKIRA ,  YONEDA ISAO

IPC: G11B21/02 ,  G11B5/596 ,  G11B21/10 ,  G11B21/21

Abstract: PROBLEM TO BE SOLVED: To compensate for vibration that is encountered in a disk drive by first detecting a governing vibration frequency and then executing a two-step algorithm for constituting an optimum servo feedback solution. SOLUTION: A detection filter for scanning a positional signal over the frequency range of vibration is composed while a data storage is operating, amplitude related to frequency is recorded, it is judged whether the recorded amplitude exceeds a specific threshold or not, the corresponding frequency of vibration is detected accordingly, and the frequency of vibration is detected. A correction filter using a plurality of filter coefficients being determined as the function of the detection frequency of vibration is constituted, and the influence of the detection frequency of vibration for the positional signal is reduced. External and internal vibrations are targeted as vibration. When the correction filter is repeatedly involved, the filter state vector as initial filter conditions is refreshed periodically in response to output from the correction filter.