Sync pattern encoding system for data sectors written on a stora

Details Sync pattern encoding system for data sectors written on a stora Sync pattern encoding system for data sectors written on a stora

1985-11-21

1987-09-29

Sloyan, T. J.

Communications: electrical

Audible indication

Percussion-type sound producer

360 40, H03M 500

Patent

active

046971670

ABSTRACT:
A system and method for generating a unique sync pattern that may be appended to a selected data sector of a disk storage system. 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 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, thereby providing the synchronization function, while still being handled and processed by the same encoding/decoding circuitry as is employed to handle and process the data.

REFERENCES:
patent: 4503420 (1985-03-01), Rub et al.

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