Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Reexamination Certificate
2011-06-07
2011-06-07
Young, Wayne R (Department: 2627)
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
Reexamination Certificate
active
07957088
ABSTRACT:
According to one embodiment, a system includes a plurality of synchronous servo channels, where each channel receives a signal from a servo reader of a magnetic head. The system also includes logic for estimating a tape velocity, logic for determining a first and second time instant representing a time at which a flag is generated by a related servo channel, logic for determining a first and second correction term representing a time difference between a time at which a peak of a correlation signal and a time at which the flag occur, logic for calculating a skew error estimate based on a reference shift value associated with a servo band pair being spanned by a head module, and logic for applying a control signal including a skew correction that corresponds to the calculated skew error estimate to the skew-following loop. Other systems and methods are disclosed as well.
REFERENCES:
patent: 6430008 (2002-08-01), Trabert et al.
patent: 6724559 (2004-04-01), Konishi et al.
patent: 6724561 (2004-04-01), Wyman
patent: 6937425 (2005-08-01), Knowles et al.
patent: 7245450 (2007-07-01), Cherubini et al.
patent: 7342738 (2008-03-01), Anderson et al.
patent: 7365929 (2008-04-01), Cherubini et al.
patent: 7436621 (2008-10-01), Goker et al.
patent: 7538966 (2009-05-01), Day
patent: 7764460 (2010-07-01), Bates et al.
patent: 2007/0171565 (2007-07-01), Cherubini et al.
patent: 2008/0024904 (2008-01-01), Cherubini et al.
patent: 2009/0161249 (2009-06-01), Takayama et al.
patent: 2009/0316296 (2009-12-01), Cherubini et al.
patent: 2010/0302677 (2010-12-01), Bates et al.
patent: 2010/0315740 (2010-12-01), Bates et al.
patent: 2007/085529 (2007-08-01), None
U.S. Appl. No. 11/969,184 filed, Jan. 3, 2008.
U.S. Appl. No. 12/716,192, filed Mar. 2, 2010.
U.S. Appl. No. 12/487,252, filed Jun. 18, 2009.
U.S. Application entitled “Servo Channel For Tape Drive Systems” Cherubini et al., International Business Machines Corporation, filed Jan. 3, 2008.
Notice of Allowance from U.S. Appl. No. 12/716,192 dated Feb. 4, 2011.
Bui Nhan X.
Cherubini Giovanni
Jelitto Jens
Tsuruta Kazuhiro
Habermehl James L
International Business Machines - Corporation
Young Wayne R
Zilka-Kotab, PC
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