Method and system for dynamically allocating read and write sequence randomizer
View Patent ↗A data formatting system and method to improve data efficiency and integrity in a hard disk are disclosed. One embodiment provides a disk drive system having a plurality of lookup tables which store a plurality of randomizer seeds which may be dynamically encoded into the preamble field of a customer data block if the customer data is deemed marginal. Encoding the randomizer seed into the preamble field prevents adjacent data track mis-writes and mis-reads.
1. A hard disk drive, comprising:
a dynamic data sequence randomizer;
a plurality of lookup tables coupled to the dynamic data sequence randomizer;
predictive code for looking up a first of a plurality of predefined randomizer seeds defined in the plurality of lookup tables;
compare logic for comparing data of an input data stream written to the hard disk drive according to said first randomizer seed to said data of said input data stream written to said hard disk drive according to another of said plurality of predefined randomizer seeds to determine whether said data of said input data stream is marginal; and
a data encoder for dynamically encoding either said first randomizer seed or said another randomizer seed of the lookup tables into a preamble field of a data sector of the data of the input data stream based on said comparing.
2. The hard disk drive of claim 1 , wherein the dynamic data sequence randomizer dynamically generates randomizer seeds for read or write operations responsive to a particular input data in the hard disk drive.
3. The hard disk drive of claim 2 , wherein the plurality of lookup tables store randomizer seeds for odd and even data tracks respectively in the hard disk drive.
4. The hard disk drive of claim 3 , wherein encoding the randomizer seed into the preamble field of the data sector of the input data increases the signal to noise ratio between adjacent data tracks in order to prevent adjacent track interference.
5. The hard disk drive of claim 4 , wherein the plurality of lookup tables may store alternating randomizer seed for alternating data tracks in the hard disk drive.