Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Reexamination Certificate
2011-07-26
2011-07-26
Sniezek, Andrew L (Department: 2627)
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
C360S066000, C360S077120
Reexamination Certificate
active
07986485
ABSTRACT:
A servo writing method is provided for use with unoriented magnetic tape media. A biasing zone is formed, such as between a pair of permanent block or disk magnets, with a strong DC magnetic field that is substantially free of perpendicular components. The method includes feeding the tape through the magnetic biasing zone to form a longitudinal magnetic bias in the magnetic layer of the tape media. The method includes using a write head to write a servo pattern on the tape media after the forming of the longitudinal magnetic bias in the tape media, and the servo pattern produces an output that is substantially symmetric with high amplitudes. In one embodiment, the biasing zone is formed or defined as the gap between first and second magnetic assemblies oriented with a single direction of magnetization, such as in the same direction as the tape travel through the biasing zone.
REFERENCES:
patent: 3548113 (1970-12-01), Althuber
patent: 4177442 (1979-12-01), Bate et al.
patent: 4440106 (1984-04-01), Greiner et al.
patent: 4466027 (1984-08-01), Howell et al.
patent: 5132860 (1992-07-01), Von Stein
patent: 5420742 (1995-05-01), Ketcham et al.
patent: 5979774 (1999-11-01), Urushibata
patent: 6462904 (2002-10-01), Albrecht et al.
patent: 7012774 (2006-03-01), Nakao et al.
patent: 7203026 (2007-04-01), Horimai
patent: 7283317 (2007-10-01), Dugas et al.
patent: 2008/0304180 (2008-12-01), Schaefer et al.
Kientz Steven M.
Mckinstry Kevin D.
Trabert Steven G.
Larsen Per H.
Lembke Kent A.
Marsh & Fischmann & Breyfogle LLP
Oracle America Inc.
Sniezek Andrew L
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