Control method for magnetic disk device, magnetic disk...

Details Control method for magnetic disk device, magnetic disk... Control method for magnetic disk device, magnetic disk...

2009-08-19

2011-11-01

Sniezek, Andrew L (Department: 2627)

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

C360S031000, C360S051000

Reexamination Certificate

active

08049986

ABSTRACT:
According to one embodiment, a control method for a magnetic disk device includes writing data by varying a phase of the array period of the plurality of magnetic elements or a phase of the time period of the recording signal in one section of the track from a corresponding phase in another section of the track, reading a reproduction signal from the track, and determining a phase shift between the array period of the plurality of magnetic elements and the time period of the recording signal, based on a reproduction signal read from the one section and a reproduction signal read from the other section. In another embodiment, a magnetic disk includes a track in which magnetic elements are magnetically separated and arranged in an array period, and a phase of the array period in one section is different from a phase in another section of the track.

REFERENCES:
patent: 6738207 (2004-05-01), Belser et al.
patent: 2006/0119965 (2006-06-01), Ohno
patent: 2009/0244765 (2009-10-01), Albrecht
patent: 2003/281701 (2003-10-01), None
patent: 2006/164349 (2006-06-01), None

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