Back to results
US 2003/0067709 A1Published application
Data storage device, head positioning apparatus and head positioning method
AssigneeInternational Business Machines Corporation
InventorsYutaka Ozawa, Masahide Yamasaki
Life of this patent
Estimating the term…
Abstract
A method and apparatus for resolving a “continuity” problem that occurs when modes are switched in the head positioning control process, and a contradiction exists between a short seek and a long seek.
Claims18
A data storage device comprising:
- a data storage medium:
- a head, writing and reading data at a predetermined access position on said data storage medium;
- and
- a positioning controller, exercising feedback control to move and position said head at said access position, and changing a gain for said feedback control in accordance with the distance between the position of said head and said access position.
1 more element
A data storage device comprising:
- a storage medium:
- a head, seeking said storage medium and accessing a predetermined track;
- a positioning controller, outputting a control current for positioning said head, based on a first mode that is applied when a distance between said head position and said access position exceeds a distance B, a second mode that is applied when said distance is greater than distance A (A<B) and is equal to or less than said distance B, and a third mode that is applied when said distance is equal to or less than said distance A;
- and
- a motor, positioning said head based on said control current output by said positioning controller,
- wherein, when the distance between the initial position of said head and the access position is greater than said distance B but is less than or equal to a distance C(B<C), said positioning controller positions said head using said first mode, said second mode and said third mode order, and wherein, when said distance between said initial position of said head and said access position is greater than said distance C, said positioning controller positions said head in accordance with said first mode, a compensated second mode, said second mode and said third mode order.
3 more elements
A head positioning apparatus, which positions a read/write head that accesses a predetermined track on a storage medium on which data is stored, comprising:
- a determination unit, when an access by said read/write head of a predetermined track is requested, determining whether a head-accessed track distance between the position of said read/write head and said predetermined track exceeds a threshold value that has been determined in advance;
- and
- a control current output unit, outputting a control current for positioning said read/write head,
- wherein, based on determination results obtained by said determination unit, said control current output unit either exercises feedback control using a predetermined parameter or by multiplying said predetermined parameter by a gain compensation coefficient, and outputs said control current for positioning said read/write head.
1 more element
A head positioning method, for positioning a read/write head that accesses a predetermined track on a storage medium on which data is stored, comprising the steps of:
- when an access by said read/write head of a predetermined track is requested, determining whether a head-accessed track distance between the position of said read/write head and said predetermined track exceeds a threshold value that has been determined in advance;
- and
- based on the determination results, deciding either to exercise feedback control using a predetermined parameter, or to exercise feedback control obtained by compensating for said feedback control based on said predetermined parameter, so as to output a control current for positioning said read/write head.
Dependencies are inferred from the claim text.