Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Reexamination Certificate
2007-04-26
2009-11-17
Sniezek, Andrew L (Department: 2627)
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
C360S078060, C388S842000
Reexamination Certificate
active
07619849
ABSTRACT:
Embodiments in accordance with the present invention provide a magnetic disk drive with reduced noise during seek operation without causing any delay in control response. According to one embodiment of the present invention, a control circuit of a magnetic disk drive controls the drive power supplied to a voice coil motor during a seek operation adapted to move a magnetic head over a target track formed on a magnetic disk so as to bring the travel speed of the magnetic head close to a predetermined target speed. The control circuit determines a provisional current according to the difference between the predetermined target speed and an actual travel speed in an acceleration zone adapted to accelerate the magnetic head to the predetermined target speed. If the provisional current exceeds a limit specified in relation to an elapsed time from the start of acceleration, the control circuit sets the limit as the current of the drive power supplied to the voice coil motor to control the motor.
REFERENCES:
patent: 4937689 (1990-06-01), Seaver et al.
patent: 5111349 (1992-05-01), Moon
patent: 5119250 (1992-06-01), Green et al.
patent: 5696647 (1997-12-01), Phan et al.
patent: 6178060 (2001-01-01), Liu
patent: 6724564 (2004-04-01), Codilian et al.
patent: 6865055 (2005-03-01), Ou-Yang et al.
patent: 6989957 (2006-01-01), Hamada et al.
patent: 7359140 (2008-04-01), Chung
patent: 2003/0189784 (2003-10-01), Galloway
patent: 2007/0253099 (2007-11-01), Derosa et al.
Ohzeki Hideki
Uchida Hiroshi
Yoneda Isao
Duncan Patrick
Hitachi Global Storage Technologies - Netherlands B.V.
Sniezek Andrew L
Townsend and Townsend / and Crew LLP
LandOfFree
Magnetic disk drive with controlled transducer movement... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Magnetic disk drive with controlled transducer movement..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Magnetic disk drive with controlled transducer movement... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-4142995