Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Patent
1983-06-30
1985-12-10
Stellar, George G.
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
360 78, 360135, 369 43, 369 44, G11B 555, G11B 556, G11B 700, G11B 2330
Patent
active
045583838
ABSTRACT:
An information storage disk is provided with a dense array of detectable marks. This pattern does not interfere with or use any otherwise available recording capacity of the storage medium. The marks are detected by a sensor different from any transducer used to read or write information into the storage medium. Information storage tracks are defined by the pattern rather than by any recorded information in the storage medium. In the preferred embodiment the storage medium is a conventional magnetic recording layer and the pattern of detectable marks are optically reflective or non-reflective spots overlying or underlying the magnetic storage medium.
The sensor is mounted over the pattern for common movement with the storage medium transducer. As the storage disk spins, the sensor produces a signal which varies as individual marks pass by. From the sensor signal is derived a signal directly related to the rate at which marks are passing under the sensor. This mark sensing rate at which marks are passing under the sensor is proportional to the product of the linear velocity of the disk under the sensor and the density of the marks in the detection region. Each discrete information storage track is characterized and defined by a discrete mark sensing rate and physically lies along a path such that the mark sensing rate obtained from the sensor attached to the transducer is substantially constant along the path and is equal to the discrete mark sensing rate characterizing and defining that track. A servo control system responding to the mark sensing rate positions the transducer such that the mark sensing rate is maintained at the rate characterizing and defining the desired track.
REFERENCES:
patent: 3426337 (1969-02-01), Black et al.
patent: 3573771 (1971-04-01), Cockrell, Jr.
patent: 3646533 (1972-02-01), Rosenblum
patent: 4326229 (1982-04-01), Yanagisawa
Drumheller Ronald L.
International Business Machines - Corporation
Stellar George G.
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