Disk drive apparatus, head position control method, and hard disk drive
AssigneeInternational Business Machines Corporation
InventorsNobuyuki Kitazaki, Kenji Ogasawara, Masahiro Shimizu
Life of this patent
Estimating the term…
Abstract
A position control system for a magnetic head improves servo tracking characteristics in a low frequency range without impairing the stability of seek operations. The position control system is equipped with two integrators: a first integrator 43 and second integrator 45. The gain K3′ of the second integrator 45 is set larger than the gain K3 of the first integrator 43. The first integrator 43 plays the role of offsetting the bias force acting on the magnetic head while the second integrator 45 plays the role of improving the servo tracking characteristics in the low frequency range.
Claims15
A disk drive apparatus, comprising:
- a disk-like medium for storing data;
- a head reads data from and writes data to the disk-like medium;
- an actuator which moves the head to a designated location on the disk-like medium;
- and
- a position control unit which positions the head by controlling a drive of the actuator;
- the position control unit comprising:
- a first integrator which generates a first gain;
- and
- a second integrator which generates a second gain that is larger than the first gain.
A disk drive apparatus, comprising:
- a disk-like medium for storing data;
- a head which performs a seek operation for moving to a designated location on the disk-like medium and a follow operation for reading or writing data staying at the designated location;
- an actuator which moves the head to the designated location on the disk-like medium;
- and
- a position control unit which positions the head by controlling an operation of the actuator;
- wherein the position control unit comprises:
- an integrator which generates a corresponding first gain during the seek operation and a second gain different from the first gain during the follow operation.
A method of head position control, comprising:
- controlling the position of a data read/write head on a storage medium based on servo information, wherein the position of the head is controlled based on a first gain when the head is moving over the storage medium, and
- the position of the head is controlled based on a second gain larger than the first gain when the head stays at a designated location on the storage medium.
A hard disk drive, comprising:
- a magnetic disk on which servo information is stored;
- a magnetic head which seeks the magnetic disk and reads or writes data staying at a designated location;
- an actuator which moves the magnetic head to the designated location on the magnetic disk;
- and
- a head position control unit which controls the position of the magnetic head based on the servo information read out by the magnetic head and which comprises an integrator;
- wherein
- the integrator generates a first gain and a second gain larger than the first gain, the first gain being generated when the magnetic head does not read or write data and the second gain being generated when the magnetic head reads or writes data.
Dependencies are inferred from the claim text.