Bias calculation, bias compensation, and bias table editing...

Details Bias calculation, bias compensation, and bias table editing... Bias calculation, bias compensation, and bias table editing...

2006-09-05

2009-02-10

Olson, Jason C (Department: 2627)

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

C360S066000

Reexamination Certificate

active

07489471

ABSTRACT:
In a hard disk drive (HDD), biases are measured across all zones of a disk, and nonlinear bias components are extracted. Upon a change in operational condition of the HDD, biases are measured at two reference positions on the disk so as to estimate a corresponding change in a linear bias component across all zones of the disk. The bias at a given position of the disk is then calculated based on the estimated linear bias component and the extracted nonlinear bias component.

REFERENCES:
patent: 5773948 (1998-06-01), Kim et al.
patent: 6738220 (2004-05-01), Codilian
patent: 7253989 (2007-08-01), Lau et al.
patent: 100260411 (2000-04-01), None
patent: 100403037 (2003-10-01), None

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