Methods and apparatus for increased magnetic coding density...

G - Physics – 06 – K

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G06K 7/08 (2006.01) G06K 1/12 (2006.01) G06K 19/06 (2006.01) G06K 19/12 (2006.01) G11B 5/09 (2006.01) G11B 20/10 (2006.01) G11B 25/04 (2006.01)

Patent

CA 2407877

Methods and apparatus for increasing the density of data storage on a magnetic medium by using variations in positioning of magnetic transitions to encode bits. Conventionally encoded bits are written to the medium as sequences of magnetic transitions according to an encoding standard. Additional bits are encoded on the medium as deviations from a nominal position of magnetic transitions separating conventionally encoded bits. The deviation from the nominal position is within an allowable range of tolerance for the standard followed in encoding the conventionally encoded bits. In order to prevent accumulation of error, additional bits are only encoded in transitions separating a pair of conventionally encoded bits. The first and last transitions of the pair do not have additional bits encoded as deviations of transition locations. This technique allows the encoding of one additional bit for every two conventionally encoded bits.

Cette invention concerne des procédés et un dispositif permettant d'accroître la densité de stockage de données sur un support magnétique en exploitant les variations de positionnement de transitions magnétiques pour le codage de bits. Des bits codés classiquement sont écrits sur le support sous forme de séquences de transitions magnétiques conformément à une norme de codage. Des bits supplémentaires sont codés sur le support en tant qu'écarts par rapport à la position nominale des transitions magnétiques entre bits codés classiquement. L'écart par rapport à la position nominale se situe dans une plage de tolérance admissible pour la norme appliquée au codage classique de bits. Dans un souci d'éviter une accumulation d'erreurs, on ne code que les bits supplémentaires dans les transitions qui séparent une paire de bits classiquement codés. La première et la dernière transitions de la paire ne comportent pas de bits supplémentaires codés en tant qu'écarts par rapport aux points de transition. Ce procédé permet de coder un bit supplémentaire tous les deux bits codés classiquement,

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