1
Patrick J Lee: Disk drive employing a multiple-input sequence detector responsive to reliability metrics to improve a retry operation. Western Digital Technologies, Milad G Shara Esq, June 11, 2002: US06405342 (204 worldwide citation)

A disk storage system is disclosed employing an improved retry operation. The disk drive comprises a disk for storing a data block, and a head for reading the data block to generate an analog read signal during an initial read operation. A sampler samples the analog read signal to generate a sequenc ...


2
Patrick J Lee: Communication channel employing an ECC decoder enhanced by likely error events of a trellis sequence detector. Western Digital Technologies, Milad G Shara Esq, Howard H Sheerin Esq, February 17, 2004: US06694477 (150 worldwide citation)

A communication channel is disclosed comprising a trellis sequence detector for detecting an estimated data sequence from signal sample values. A post processor detects and corrects an error event of the trellis sequence detector by remodulating the estimated data sequence into a sequence of expecte ...


3
Patrick J Lee: Disk drive comprising a multiple-input sequence detector selectively biased by bits of a decoded ECC codedword. Western Digital Technologies, Milad G Shara Esq, Howard H Sheerin Esq, August 5, 2003: US06604220 (130 worldwide citation)

A disk drive is disclosed comprising a multiple-input sequence detector for detecting an estimated data sequence from a sequence of read signal sample values. The multiple-input sequence detector comprises a first iterative detector and a second iterative detector. An error correction code (ECC) dec ...


4
Steven R Vasquez, Patrick J Lee: Disk drive implementing data path protection by encoding large host blocks into sub blocks. Western Digital Technologies, Howard H Sheerin Esq, May 26, 2009: US07539924 (125 worldwide citation)

A disk drive is disclosed including a disk having a plurality of data tracks, wherein each data track includes a plurality of data sectors. A head is actuated over the disk for accessing the data sectors. A write command is received from a host, wherein the write command includes a host block and co ...


5
Steven R Vasquez, Patrick J Lee: Storage device implementing data path protection by encoding large host blocks into sub blocks. Western Digital Technologies, April 30, 2013: US08433977 (108 worldwide citation)

A storage device is disclosed comprising control circuitry. A write command is received from a host, wherein the write command comprises a host block and corresponding host block address. The host block is partitioned into a plurality of sub blocks, and a plurality of sub block addresses are generat ...


6
Steven R Vasquez, Patrick J Lee: Data storage device employing high quality metrics when decoding logical block address appended to a data sector. Western Digital Technologies, April 2, 2013: US08413010 (108 worldwide citation)

A data storage device is disclosed that receives a read command from a host, wherein the read command comprises a read logical block address (LBA_R). A target data sector is read in response to the LBA_R to generate a read signal. The read signal is processed to detect user data and redundancy data ...


7
Patrick J Lee: Error correction code for correcting shift and additive errors. Western Digital Technologies, December 13, 2011: US08078943 (106 worldwide citation)

An error correction system is disclosed comprising an encoder operable to generate an encoded codeword of a polynomial code over a Galois field GF(q) comprising q elements, wherein the encoded codeword comprises an input data sequence, at least one check symbol, and redundancy symbols. A decoder dec ...


8
Alvin J Wang, Patrick J Lee, Manmohan K Sharma: Disk drive margining read channel by biasing log-likelihood ratios of an iterative decoder. Western Digital Technologies, November 19, 2013: US08589773 (105 worldwide citation)

A disk drive is disclosed comprising a head actuated over a disk comprising a plurality of data tracks. A read signal emanating from the head is sampled to generate read samples, and first log-likelihood ratios (LLRs) are generated in response to the read samples. The first LLRs are biased to genera ...


9
Patrick J Lee: Disk drive margining read channel by biasing log-likelihood ratios of a nonbinary iterative decoder. Western Digital Technologies, December 25, 2012: US08339919 (59 worldwide citation)

A disk drive is disclosed comprising a head actuated over a disk and control circuitry operable to sample a read signal emanating from the head to generate read samples. First vectors of log-likelihood ratios (LLRs) are generated in response to the read samples, wherein each vector corresponds to a ...


10
Patrick J Lee: Data storage device generating redundancy for data path protection of a parity sector. Western Digital Technologies, March 11, 2014: US08671250 (54 worldwide citation)

A data storage device is disclosed comprising a non-volatile memory. A write command is received comprising a first logical block address (LBA) and first user data, and a second LBA and second user data. The first LBA is mapped to a first physical block address (PBA) for addressing a first memory se ...



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