Sync pattern encoding system for data sectors written on a...

H - Electricity – 03 – M

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352/32.1

H03M 7/46 (2006.01) G06T 9/00 (2006.01) G11B 7/00 (2006.01) G11B 7/013 (2006.01) G11B 20/12 (2006.01) G11B 20/14 (2006.01) G11B 20/18 (2006.01) G11B 27/30 (2006.01) G11B 27/36 (2006.01)

Patent

CA 1234914

ABSTRACT OF THE DISCLOSURE A system and method for generating a unique sync pattern that may be appended to a selected data sector of a disk storage system (20). The data to be stored in the disk storage system is encoded in accordance with a desired fixed rate run-length limited code, such as a 2-7 code. The unique sync pattern is generated by first encoding a prescribed data word (BF7A) in accordance with the desired code. At least one bit of the encoded prescribed data word is then changed in a manner such that the changed encoded word still complies with the coding rules of the desired code, yet the resulting bit pattern does not represent any valid sequence of data in accordance with the desired code. Hence, the changed encoded word may be readily distinguished from data using sync detect logic (204), thereby providing the synchronization function, while still being handled and processed by the same encoding/decoding circuitry (136, 137) as is employed to handle and process the data.

463428

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