Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Patent
1985-11-20
1987-08-18
Stellar, George G.
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
G11B 556
Patent
active
046881190
ABSTRACT:
A disk drive control system including servo sectors written on a disk, with each sector containing three sets of marker pulses arranged so that three adjacent marker pulses from each of the sets spans two tracks. The pulses each comprise high frequency sinusoidal signals. Servo control depends upon the pulse amplitudes sensed by the read/write head while traversing a servo sector. The system includes an amplifier to rectify and amplify the high frequency signals, a sample-and-hold circuit to hold at least three value representative of the amplified high frequency signals, and synchronizing means to synchronize the sample-and-hold circuit such that the first value sampled and held is representative of the amplitude of the first pulse read in a servo sector, the second value sampled and held is representative of the amplitude of the second pulse read in the servo sector, and so forth. A multiplexing circuit provides multiplexed signals sequentially representative of values sampled.
REFERENCES:
patent: 4087843 (1978-05-01), Louis et al.
patent: 4130844 (1978-12-01), Klinger
patent: 4297734 (1981-10-01), Laishley et al.
patent: 4380034 (1983-04-01), Krake
patent: 4462053 (1984-07-01), Lum et al.
patent: 4498129 (1985-02-01), Velazquez
patent: 4511938 (1985-04-01), Betts
IBM Technical Disclosure Bulletin, vol. 20, No. 5, Oct. 1977, pp. 1789-1791, Rotating Record Disk Initialization For Sector Servoing, Dennison et al.
Stellar George G.
Xebec Development Partners, Ltd.
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