Dynamic magnetic information storage or retrieval – General recording or reproducing – Thermomagnetic recording or transducers
Patent
1998-08-05
2000-04-18
Dinh, Tan
Dynamic magnetic information storage or retrieval
General recording or reproducing
Thermomagnetic recording or transducers
369 14, G11B 509
Patent
active
060522496
ABSTRACT:
A method and apparatus for accessing a data storage medium having raised and lowered portions indicative of data stored on the medium. Energy is supplied to a sensor which is moved relative to, and in close proximity to, a surface of the medium on which the data in the form of raised and lowered portions is stored. The sensor and the storage medium are moved in relation thereto, such that the sensor remains at a substantially constant fly spacing therefrom. A decrease in temperature of the sensor is detected when it is in proximity to a variation, i.e., a raised portion on the medium. This detected decrease in temperature associated with a raised variation, e.g., asperity, can be used as the basis upon which to detect the data on the data storage medium. The data storage medium may also contain magnetically stored data, such that the surface variations and the magnetic characteristics of the data storage medium can both be utilized to store data thereon.
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Abraham David William
Praino Anthony Paul
Re Mark Edward
Wickramasinghe Hemantha Kumar
Dinh Tan
International Business Machines - Corporation
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