Control method and apparatus of magnetic disc device, recording medium, and inspection method and apparatus of magnetic disc device
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorTetsuro Takaoka
Life of this patent
Estimating the term…
Abstract
Noise level superposed on the head position detected by a position detector 103 is measured by a noise measuring unit 110, and an estimate position gain corresponding to the measured noise level is determined by a gain determining unit 111. An estimator 106 adds the logically calculated model position, and the result of the difference between the detected position and model position multiplied by the estimate position gain, so that the estimate position is calculated at high precision.
Claims32
A control apparatus of magnetic disc device having a magnetic disc including servo sectors recording track numbers and plural burst signals provided in plural data regions divided in the peripheral direction, and an actuator for driving a head for recording and reproducing data in said magnetic disc, comprising:
- a position detector for detecting a head position of said head in track width direction from the burst signals,
- noise measuring means for measuring noise level superposed on the head position detected by said position detector,
- gain determining means for determining an estimate gain corresponding to the noise level, and
- an estimator for estimating state of said actuator.
An inspection apparatus of magnetic disc device having a magnetic disc including servo sectors recording track numbers and plural burst signals provided in plural data regions divided in peripheral direction, and an actuator for driving a head for recording and reproducing data in said magnetic disc,
- wherein said inspection apparatus
- (i) adds amplitude values of burst signals used in position control of said head,
- (ii) calculates an average, and a variance value or a standard deviation of the added amplitude values, and
- (iii) inspects said magnetic disc device by the variance value or the standard deviation.
A control method of magnetic disc device having a magnetic disc including servo sectors recording track numbers and plural burst signals provided in plural data regions divided in peripheral direction, and an actuator for driving a head for recording and reproducing data in said magnetic disc, comprising the steps of:
- (a) detecting a head position in track width direction from said burst signals,
- (b) measuring noise level superposed on the head position,
- (c) determining an estimate gain corresponding to the noise level, and
- (d) estimating a state of said actuator.
An inspection method of magnetic disc device having a magnetic disc including servo sectors recording track numbers and plural burst signals provided in plural data regions divided in peripheral direction, and an actuator for driving a head for recording and reproducing data in said magnetic disc, comprising the steps of:
- adding amplitude values of burst signals used in position control of said head,
- calculating an average value, and a variance value or a standard deviation of the added amplitude values, and
- inspecting the magnetic disc device by the variance value or the standard deviation.
A recording medium storing a computer program data for executing a control method of magnetic disc device having a magnetic disc including servo sectors recording track numbers and plural burst signals provided in plural data regions divided in the peripheral direction, and an actuator for driving a head for recording and reproducing data in said magnetic disc, wherein the stored computer program comprises:
- (a) a program for detecting a head position of said head in the track width direction from said burst signals,
- (b) a program for measuring noise level superposed on the head position,
- (c) a program for determining an estimate gain corresponding to the noise level, and
- (d) a program for estimating a state of said actuator from the model of the actuator.
Dependencies are inferred from the claim text.