Dynamic magnetic information storage or retrieval – Record transport with head stationary during transducing – Disk record
Patent
1992-03-10
1994-03-01
Wolff, John H.
Dynamic magnetic information storage or retrieval
Record transport with head stationary during transducing
Disk record
360 9908, G11B 1702
Patent
active
052913554
ABSTRACT:
A hard disk drive for a computer system including a head disk assembly with a disk platter of approximately one-and-eight-tenths-inch in diameter capable of storing more than forty megabytes. In an embodiment, data tracks on each data surface of the platter are spaced at approximately 2,558 tracks per inch and each data track has approximately 36,000 flux changes per inch. An actuator positions a pair of read/write heads on each platter surface using a voice coil motor to position the heads over a cylinder. A magnetic actuator latch attaches to another magnet on the actuator and locks the heads in a parked position at the innermost diameter of the platter. A spindle motor rotates the platter at approximately 5,400 revolutions per minute. A base plate, with a gasketed surface and a raised lip, hermetically seals with a cover to the base plate such that the platter, the actuator, the actuator latch, and the spindle motor are all contained within. The cover carries a breather filter and recirculating air filter. The raised lip on the base plate prevents direct electrical interference from passing between the base plate and the cover.
REFERENCES:
patent: 4568988 (1986-02-01), McGinlay et al.
patent: 4982296 (1991-01-01), Brown et al.
patent: 5025335 (1991-06-01), Stefansky
patent: 5204793 (1993-04-01), Plonczak
patent: 5223993 (1993-06-01), Squires
"Integral Ships First . . .", Sep. 2, 1991, Electronic Eng. Times doc #69834.
"Startup to Introduce . . . " Sep. 2, 1991, PC Week, doc #70087.
"First Sub-Mini Hard Disk" Jan. 14, 1992, by C. Barr Integral Peripherals Inc.
"Comdex: Integral Peripherals . . . " by J. Mallory Oct. 24, 1991 Newsbytes Inc. 1991.
Preliminary Specifications/Datasheet, Mustang model 1820, Stingray model 1842, .COPYRGT.1991, Integral Peripherals, Inc.
Barnard Daniel E.
Cloutier Robert P.
Deyring Klaus-Peter
Hatch Michael R.
Huber Thomas J.
NEC Corporation
Schatzel Thomas E.
Wolff John H.
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