Sync pattern encoding system for data sectors written on a storage medium
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United States of America Patent
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Sep 29, 1987
Issued Date -
N/A
app pub date -
Nov 21, 1985
filing date -
Sep 19, 1983
priority date (Note) -
Expired
status (Latency Note)
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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.
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