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US 7,002,764 B2Granted
Method and apparatus for providing generalized write pre-compensation
AssigneeHitachi Global Storage Technologies Netherlands B.V.
InventorsFirmin M. Musungu, Joey M. Poss, Brent A. Sadowy
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Abstract
A method and apparatus providing generalized write pre-compensation is disclosed. The present invention provides multiple phase signals to choose from for provide a shift to received write data to achieve a desired pre-compensation.
Claims34
A circuit for providing generalized write pre-compensation, comprising:
- a coarse phase generator for generating N coarse phase signals;
- a fine phase generator, coupled to the coarse phase generator, for using the N coarse phase signals to generate M fine phase signals;
- and
- a write pre-compensation circuit, coupled to the fine phase generator, for choosing a fine phase signal from the M fine phase signals to provide a shift to received write data to achieve a first desired pre-compensation.
1 more element
A magnetic storage device, comprising:
- a magnetic storage medium for recording data thereon;
- a motor for moving the magnetic storage medium;
- a head for reading and writing data on the magnetic storage medium;
- an actuator for positioning the head relative to the magnetic storage medium;
- and
- a data channel for processing encoded signals on the magnetic storage medium, the data channel comprising a coarse phase generator for generating N coarse phase signals, a fine phase generator, coupled to the coarse phase generator, for using the N coarse phase signals to generate M fine phase signals and a write pre-compensation circuit, coupled to the fine phase generator, for choosing a fine phase signal from the M fine phase signals to provide a shift to received write data to achieve a first desired pre-compensation.
3 more elements
A method for providing generalized write pre-compensation, comprising:
- generating N coarse phase signals;
- using the N coarse phase signals to generate M fine phase signals;
- and
- choosing a fine phase signal from the M fine phase signals to provide a shift to received write data to achieve a first desired pre-compensation.
1 more element
Dependencies are inferred from the claim text.