Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Reexamination Certificate
2006-05-02
2006-05-02
Hudspeth, David (Department: 2651)
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
Reexamination Certificate
active
07038875
ABSTRACT:
The present invention is a novel method and apparatus for determining head media modulation in a magnetic data storage and retrieval system. The magnetic data storage and retrieval system includes a magnetic disc with a stored signal and a transducing head for reading a readback signal based on the stored data. The system includes a data acquisition and processing circuit. The processing circuit generates a dynamic harmonic ratio for the readback signal. The processing circuit also generates a head media modulation signal as a function of time from the dynamic harmonic ratio.
REFERENCES:
patent: 4777544 (1988-10-01), Brown et al.
patent: 5130866 (1992-07-01), Klaassen et al.
patent: 5168413 (1992-12-01), Coker et al.
patent: 5311287 (1994-05-01), Amer
patent: 5377058 (1994-12-01), Good et al.
patent: 5408372 (1995-04-01), Karam, II
patent: 5410439 (1995-04-01), Egbert et al.
patent: 5673110 (1997-09-01), Erickson et al.
patent: 5751510 (1998-05-01), Smith et al.
patent: 5909330 (1999-06-01), Carlson et al.
patent: 6008176 (1999-12-01), Schneider et al.
patent: 6008640 (1999-12-01), Tan et al.
patent: 6011239 (2000-01-01), Singh et al.
patent: 6191901 (2001-02-01), Carlson et al.
patent: 6249393 (2001-06-01), Billings et al.
patent: 6266199 (2001-07-01), Gillis et al.
patent: 6268976 (2001-07-01), Carlson et al.
patent: 6288856 (2001-09-01), Ottesen et al.
patent: 6384995 (2002-05-01), Smith
patent: 6415238 (2002-07-01), Ottesen et al.
patent: 6417981 (2002-07-01), Smith
patent: 6452735 (2002-09-01), Egan et al.
patent: 6459539 (2002-10-01), Carlson et al.
patent: 6519102 (2003-02-01), Smith et al.
patent: 6608727 (2003-08-01), Ottesen et al.
patent: 6611389 (2003-08-01), Liu et al.
R.L. Wallace, Jr., The Reproduction of Magnetically Recorded Signals, pp. 1145-1173.
Klaas B. Klaassen,Fellow, IEEE, and Jack C.L. van Peppen,Member, IEEEHead-Medium Clearance and Lateral Track Registration of a Recording Head as Measured from the Readback Signal, Jan. 2001 pp. 575-582.
Bruce C. Schardt, Erhard Schreck, Richard Sonnenfeld, Quinn Haddock and John R. Haggis, Flying Height Measurement while Seeking in Hard Disk Drives, Jul. 1998 pp. 1765-1767.
V.J. Novotny and M.-J. Hsiao, Sensitive Magnetic Readback Head—Disk Spacing Measurements in Recording Drives, Jul. 1998, pp. 1762-1764.
Robert Eaton and Michael Baldwinson, Imaging of Media Lubricant Spacing Contributions by Readback Signal Analysis, Jan. 1997, pp. 974-977.
Youping Deng, Hsiao-chu Tsai, and Brian J. Nixon, Drive-Level Flying Height Measurements and Altitude Effects, Nov. 1994, pp. 4191-4193.
W.K. Shi, L. Y. Zhu, and D. B. Bogy, Use of Readback Signal Modulation to Measure Head/Disk Spacing Variaitons in Magnetic Disk Files, Jan. 1987, pp. 233-240.
Y. Ohtsubo, N. Kawashima and H. Marumo, Measurement Method for the Spacing Fluctuation of a Head Slider in a Magnetic Disk Drive, Sep. 1987, pp. 3450-3452.
Boutaghou Zine-Eddine
Lou Huazhou
Hudspeth David
Kinney & Lange , P.A.
Tzeng Fred F.
LandOfFree
Dynamic measurement of head media spacing modulation does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Dynamic measurement of head media spacing modulation, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Dynamic measurement of head media spacing modulation will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3628615