Magnetic recording disk and disk drive with patterned...

Details Magnetic recording disk and disk drive with patterned... Magnetic recording disk and disk drive with patterned...

2007-08-11

2010-12-07

Mercedes, Dismery E (Department: 2627)

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Data in specific format

C360S053000, C360S077020, C360S078040

Reexamination Certificate

active

07848039

ABSTRACT:
A magnetic recording disk drive uses a disk having pre-patterned servo sectors extending generally radially across the data tracks. The servo sectors include at least two position error signal (PES) bursts or fields. The phases of the PES fields in the servo readback signal are demodulated to generate a PES to control the disk drive actuator for positioning the read/write heads. Each field contains generally radially directed magnetized stripes, with each stripe comprising a plurality of islands forming a zigzag pattern. The stripes have alternating polarity of magnetizations in the along-the-track direction. In one implementation there are four fields: a first pair of fields A and B wherein the zigzag pattern of the radial stripes in field A is the mirror image about a radial line of the zigzag pattern of the radial stripes in field B, and a second like pair of fields C and D, but wherein the radial stripes in fields C and D are shifted radially by one-half the island radial height from the radial stripes in fields A and B.

REFERENCES:
patent: 4549232 (1985-10-01), Axmear et al.
patent: 4912585 (1990-03-01), Belser et al.
patent: 5587223 (1996-12-01), White
patent: 5820769 (1998-10-01), Chou
patent: 6157511 (2000-12-01), Liikanen
patent: 6383598 (2002-05-01), Fullerton et al.
patent: 6529341 (2003-03-01), Ishida et al.
patent: 6738205 (2004-05-01), Moran et al.
patent: 6751035 (2004-06-01), Belser
patent: 6754016 (2004-06-01), Messner et al.
patent: 6842305 (2005-01-01), Molstad et al.
patent: 6873487 (2005-03-01), Molstad
patent: 6961203 (2005-11-01), Baker
patent: 7095580 (2006-08-01), Ehrlich et al.
patent: 7106544 (2006-09-01), Dugas et al.
patent: 7110209 (2006-09-01), Ehrlich et al.
patent: 7203023 (2007-04-01), Kuroda et al.
patent: 7209314 (2007-04-01), Bandic et al.
patent: 7236325 (2007-06-01), Albrecht et al.
patent: 7440224 (2008-10-01), Ehrlich et al.
patent: 7474486 (2009-01-01), Winarski et al.
patent: 7522371 (2009-04-01), Koski et al.
patent: 7612961 (2009-11-01), Yamamoto
patent: 7643234 (2010-01-01), Albrecht et al.
patent: 2003/0107833 (2003-06-01), Rettner et al.
patent: 2005/0157417 (2005-07-01), Ehrlich
patent: 2006/0280975 (2006-12-01), Albrecht et al.
patent: 2007/0258161 (2007-11-01), Richter et al.
Lin, et al., “Investigation of advanced position error signal patterns in patterned media”, J. Appl. Phys., vol. 87, No. 9, May 1, 2000, pp. 5117-5119.
Baker, “Direct print servo patterns for disk drive”, J. Appl. Phys., vol. 97, 10P105 (2005).

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