Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Reexamination Certificate
2007-12-28
2010-02-23
Sniezek, Andrew L (Department: 2627)
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
C360S077080, C360S078040
Reexamination Certificate
active
07667920
ABSTRACT:
A method for correcting a track pitch error in servo tracks written on a magnetic recording media coupled with a disk surface, by using a subsequent servo-write pass, comprises propagating servo tracks across the magnetic recording media in a previous servo-write pass. The servo tracks have radial positioning servo code. The servo tracks enable a magnetic transducer to be positioned to at least one radial position on the magnetic recording media. At least one corrected radial reference point is calculated for the track pitch error written on the magnetic recording media, by identifying at least one inconsistency between a mechanical response of an actuator and the track pitch. A corrected location for at least one servo track is identified. At least one new servo track at the corrected location is propagated with the subsequent servo-write pass. Optimum data track distribution across the disk surface and optimum reading and writing of data to and from the magnetic recording media is enabled.
REFERENCES:
patent: 4918972 (1990-04-01), Kenny et al.
patent: 6130796 (2000-10-01), Wiselogel
patent: 6344942 (2002-02-01), Yarmchuk
patent: 6469859 (2002-10-01), Chainer et al.
patent: 6624963 (2003-09-01), Szita
patent: 6751042 (2004-06-01), Bi et al.
patent: 6765744 (2004-07-01), Gomez et al.
patent: 6785084 (2004-08-01), Szita
patent: 6950256 (2005-09-01), Kadokawa
patent: 7088533 (2006-08-01), Shepherd et al.
patent: 7164552 (2007-01-01), Yamamoto
patent: 1592007 (2005-11-01), None
patent: 01296473 (1989-11-01), None
patent: 03203071 (1991-09-01), None
Melkote, et al., “A Study of Radial Error Propagation and Self-Servowriting in Disk Drives”,Proceedings of the American Control Conference, (May 2002),1372-1377.
Ye, et al., “Radial Error Propagation Issues in Self-Servo Track Writing Technology”,IEEE Transactions on Magnetics, vol. 38, No. 5, (Sep. 2002),2180-2183.
Patwardhan Satyajit N.
Smith Steven C.
Hitachi Global Storage Technologies - Netherlands B.V.
Sniezek Andrew L
LandOfFree
Correcting a track pitch error with a subsequent servo-write... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Correcting a track pitch error with a subsequent servo-write..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Correcting a track pitch error with a subsequent servo-write... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-4217710