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Double-Pulse Write Technique With Half Window Codes for Magnetic Recording Signals

IP.com Disclosure Number: IPCOM000046106D
Original Publication Date: 1983-Jun-01
Included in the Prior Art Database: 2005-Feb-07
Document File: 2 page(s) / 28K

Publishing Venue

IBM

Related People

Aziz, RA: AUTHOR

Abstract

A double-pulse write current technique is disclosed that can be used to write on tape in a magnetic recording device. The write current configuration is shown in Fig. 1A.

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Double-Pulse Write Technique With Half Window Codes for Magnetic Recording Signals

A double-pulse write current technique is disclosed that can be used to write on tape in a magnetic recording device. The write current configuration is shown in Fig. 1A.

For higher linear density it is possible to trade off amplitude for clocking window, and modify the data encoding to maximize available linear density. This results in a recording signal wherein flux changes per inch are fewer than data bits per inch (for example, in 2, 7 or 1, 6 Franaszek code).

The proposed method of write current configuration permits recording on tape with one of the above codes (2, 7 - 1, 6), thus minimizing raw linear density requirements from the head-media and spacing configurations.

Fig. lB shows such a write current configuration. For data encoded with 1, 6 code, there are six different wavelengths: 1, 3/2, 2, 5/2, 3, 7/2. With this double current write method, the different wavelengths can be written by inserting a required number of write current null pairs (Fig. 1B).

The double-pulse method maintains all the advantages of previous write methods in terms of MR (magentoresistive) head limitations and overwrite, with an extension to write on tape when using half-window codes.

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