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A disk drive that includes a base, a magnetic disk, a rotary actuator that carries a head for reading and writing data from the disk in a track-following mode under the control of a servo control system, and at least two sensors--one fixed sensor rigidly coupled to the overall disk drive and one mob

A disk drive that includes a base, a magnetic disk, a rotary actuator that carries a head for reading and writing data from the disk in a track-following mode under the control of a servo control system, and at least two sensors--one fixed sensor rigidly coupled to the overall disk drive and one mobile sensor mounted to the rotating actuator--for differentially detecting accelerations of the rotary actuator relative to the overall disk drive and its disk. The disk drive detects and actively compensates for accelerations imparted to a balanced actuator that has an effective imbalance. The fixed sensor is preferably mounted to a PCBA that is secured to the base. The mobile sensor is preferably mounted to an actuator arm of the rotary actuator, as far outboard as possible, and so as to align with the fixed sensor as the rotary actuator swings through its range of travel. The preferred sensors are linear accelerometers.

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A disk drive that includes a base, a magnetic disk, a rotary actuator that carries a head for reading and writing data from the disk in a track-following mode under the control of a servo control system, and at least two sensors--one fixed sensor rigidly coupled to the overall disk drive and one mob

A disk drive that includes a base, a magnetic disk, a rotary actuator that carries a head for reading and writing data from the disk in a track-following mode under the control of a servo control system, and at least two sensors--one fixed sensor rigidly coupled to the overall disk drive and one mobile sensor mounted to the rotating actuator--for differentially detecting accelerations of the rotary actuator relative to the overall disk drive and its disk. The disk drive detects and actively compensates for accelerations imparted to a balanced actuator that has an effective imbalance. The fixed sensor is preferably mounted to a PCBA that is secured to the base. The mobile sensor is preferably mounted to an actuator arm of the rotary actuator, as far outboard as possible, and so as to align with the fixed sensor as the rotary actuator swings through its range of travel. The preferred sensors are linear accelerometers. http://www.photon.com/pra/pra.html, Photon Research Associates, Inc., "GCI Toolkit," printed on Mar. 26, 2002, 5 pages. World Wide Web, http://www.vis-sim.org/db.asp?cat13ref=200, VIS-SIM.ORG, "Resource Database", printed on Mar. 26, 2002, 1 page. World Wide Web, http://www.cg2.com/products/products_main.htm, CG2, Inc., "Products Available from CG2, Inc." printed Apr. 5, 2002, 1 page. Greg Jaffe, Busy Signals: Modern Warfare Strains Capacity to Communicate, The Wall Street Journal, Apr. 10, 2002, 4 pages.