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Automatic Hi/Lo Coercivity Selection for Encoding Magnetic Media

IP.com Disclosure Number: IPCOM000013417D
Original Publication Date: 2001-May-01
Included in the Prior Art Database: 2003-Jun-18
Document File: 2 page(s) / 59K

Publishing Venue

IBM

Abstract

Disclosed is a design modification to allow a currently available hand operated, slot type, magnetic device to automatically select the type of encoding to be performed based on the media's coercivity characteristics. The existing device is assumed to have the capability to encode both high and low coercivity media. The design modification allows for the automatic selection and encoding in a single swipe of the media, assuming error correction is not required. Implementation of the Concept Referring to the figure above the general concept can be implemented as described below; The encode and read heads connected to driver D2 and receiver R2 respectively would be hardware, having the ability to read and encode in the high or low coercivity modes, as might be found in currently available slot type devices . The new heads, connected to new driver D1 and receiver R1, would only require the ability to encode and read low coercivity recordings. These heads would use the same track positions as the original heads. A micro processor would be able to select a read signal, via the new SEL circuit, and select a driver, via the new MUX circuit.

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Automatic Hi/Lo Coercivity Selection for Encoding Magnetic Media

  Disclosed is a design modification to allow a currently available hand operated, slot type, magnetic device to automatically select the type of encoding to be performed based on the media's coercivity characteristics. The existing device is assumed to have the capability to encode both high and low coercivity media. The design modification allows for the automatic selection and encoding in a single swipe of the media, assuming error correction is not required.

Implementation of the Concept

Referring to the figure above the general concept can be implemented as described below;

The encode and read heads connected to driver D2 and receiver R2 respectively would be hardware, having the ability to read and encode in the high or low coercivity modes, as might be found in currently available slot type devices . The new heads, connected to new driver D1 and receiver R1, would only require the ability to encode and read low coercivity recordings. These heads would use the same track positions as the original heads. A micro processor would be able to select a read signal, via the new SEL circuit, and select a driver, via the new MUX circuit.

During encoding, as the card media is passed through the device slot, the new encode head would attempt to encode a "unique, known pattern" of bits and erasure space at low coercivity on the track position to be recorded. At the same time, the new read head would look fo...