Magnetic hard disk drive with countermeasure against spike...

Details Magnetic hard disk drive with countermeasure against spike... Magnetic hard disk drive with countermeasure against spike...

2005-04-11

2008-09-23

Feild, Joseph (Department: 2627)

Dynamic magnetic information storage or retrieval

General recording or reproducing

C360S025000, C360S110000

Reexamination Certificate

active

07428115

ABSTRACT:
Embodiments of the invention provide a countermeasure against spike noise maintaining the data reliability of a magnetic recording layer. In one embodiment, the magnetic domain state right below and around the read head of the soft magnetic layer in the recording medium is locally and temporarily equalized using the write head, whereby, the effect of the spike noise caused by the magnetic domain boundaries (magnetic domain walls) of the soft magnetic layer on the read waveform is prevented. The read retry action of the magnetic hard disk drive is used as the trigger for the timing of the magnetic field application, thereby shortening the time for the magnetic field application.

REFERENCES:
patent: 6324032 (2001-11-01), Ohtsuka et al.
patent: 2002/0034052 (2002-03-01), Takeo et al.
patent: 2004/0150912 (2004-08-01), Kawato et al.
patent: 2002-100020 (2002-04-01), None
patent: 2002-298326 (2002-10-01), None
patent: 2003-045015 (2003-02-01), None
patent: 2003-168207 (2003-06-01), None
Darragh et al., “Observation of Underlayer Domain Noise in Perpendicular Recording Disks,” IEEE Transactions on Magnetics, vol. 29, No. 6, (Nov. 1993), pp. 3742-3744.

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