Dynamic magnetic information storage or retrieval – General processing of a digital signal – Data in specific format
Reexamination Certificate
2007-07-31
2009-06-23
Feild, Joseph H (Department: 2627)
Dynamic magnetic information storage or retrieval
General processing of a digital signal
Data in specific format
C360S075000, C360S077120
Reexamination Certificate
active
07551378
ABSTRACT:
A method and apparatus for writing timing-based magnetic servo band patterns on magnetic storage media. The apparatus includes a magnetic head and a tri-state driver. The driver is adapted to control three magnetic head states including two writes states having positive and negative current outputs, respectively, for performing a write sequence and a rest state, having no current output for avoiding overwriting of the magnetic pattern between write sequences. The driver is further adapted to gradually change the magnetic head state from a rest state to a write state before beginning a write sequence and to gradually change the magnetic head state back to a rest state upon completing a write sequence. Thus, strong uniform signal pulses are produced upon playback of the magnetic pattern.
REFERENCES:
patent: 4970621 (1990-11-01), Gailbreath et al.
patent: 5010430 (1991-04-01), Yamada et al.
patent: 5095393 (1992-03-01), Janz
patent: 5168395 (1992-12-01), Klaassen et al.
patent: 5572392 (1996-11-01), Aboaf et al.
patent: 5867334 (1999-02-01), Soichi et al.
patent: 5894237 (1999-04-01), Brannon et al.
patent: 5910861 (1999-06-01), Ahn
patent: 5946157 (1999-08-01), Codilian et al.
patent: 6169640 (2001-01-01), Fasen
patent: 6252736 (2001-06-01), Mattison
patent: 6271977 (2001-08-01), Chung et al.
patent: 6301068 (2001-10-01), Ionescu
patent: 6320719 (2001-11-01), Albreeht et al.
patent: 6510012 (2003-01-01), Chaiken et al.
patent: 6532123 (2003-03-01), Veenstra et al.
patent: 6670827 (2003-12-01), Strzalkowski
patent: 6678116 (2004-01-01), Dugas
patent: 7280294 (2007-10-01), Eaton et al.
patent: 2003/0090828 (2003-05-01), Venca et al.
patent: 2003/0095353 (2003-05-01), Nakao
patent: 2003/0184901 (2003-10-01), Takahashi
patent: 2001-109758 (2001-04-01), None
Eisele, et al., “DC Equalizing Write Driver,” IBM Technical Disclosure Bulletin, vol. 18, No. 1, Jun. 1975, pp. 252-253.
Feild Joseph H
Gibb I.P. Law, LLC
International Business Machines - Corporation
Negrón Daniell L
LandOfFree
Tri-state servowriter driver with slow return to zero does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Tri-state servowriter driver with slow return to zero, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Tri-state servowriter driver with slow return to zero will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-4105576