Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Reexamination Certificate
2006-04-28
2008-03-25
Wong, K. (Department: 2627)
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
C360S031000
Reexamination Certificate
active
07349170
ABSTRACT:
A method monitors operation of a disk drive. The method includes providing a disk drive which includes a rotating disk and a head having a read transducer in proximity to a surface of the disk and an adjustment mechanism which controllably adjusts an average relative spacing between the read transducer and the surface. The method further includes generating a read-back signal by reading from the surface using the read transducer. The read-back signal includes a high frequency carrier signal having an envelope that is modulated by a lower frequency signal. The method further includes varying the average relative spacing between the read transducer and the surface using the adjustment mechanism. The method further includes analyzing the envelope in the frequency domain and detecting an emergence of at least one frequency component of the envelope within an air bearing resonance range of frequencies.
REFERENCES:
patent: 4777544 (1988-10-01), Brown et al.
patent: 5130866 (1992-07-01), Klaasen et al.
patent: 5410439 (1995-04-01), Egbert et al.
patent: 5594595 (1997-01-01), Zhu
patent: 5784296 (1998-07-01), Baker et al.
patent: 5901001 (1999-05-01), Meyer et al.
patent: 5991113 (1999-11-01), Meyer et al.
patent: 6008640 (1999-12-01), Tan et al.
patent: 6100683 (2000-08-01), Lim et al.
patent: 6407874 (2002-06-01), Smith et al.
patent: 6570730 (2003-05-01), Lewis et al.
patent: 6665134 (2003-12-01), Ottesen et al.
patent: 6674590 (2004-01-01), Ottesen et al.
patent: 6785081 (2004-08-01), Chapin et al.
patent: 6801376 (2004-10-01), Smith
patent: 6967805 (2005-11-01), Hanchi et al.
Run-Han Wang et al., “Head-Disk Dynamics in the Flying, Near Contact, and Contact Regimes,” Journal of Tribology, vol. 123, Issue 3, Jul. 2001, pp.561-565.
Buttar Jagdeep S.
Kharady Yogesh P.
Pan Tao
Rudman Victor
Knobbe Martens Olson & Bear
Prejean, Esq. Jonathan E.
Western Digital (Fremont) , LLC
Wong K.
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