Avago Technologies General IP (singapore) Pte. Ltd.

Lsi Corporation

Yuqing Yang

Shaohua Yang

Wei Zhang

Xuebin Wu

Qi Zuo

Haitao Xia

Yang Han

Lu Lu

Kapil Gaba

Yoon Liong Liow

Han Fang

Xiao Jun Wang

Gu Zhao

Ku Hong Jeong

Methods and systems are provided for the compression and decompression of data. The compression and decompression of data may include partitioning the data into chunks, analyzing the individual chunks to determine the best compression and decompression encoders to utilize for the next data chunk of a data file. In compressing and decompressing using the mentioned technique, the data is delivered to the requesting client in an efficient and speedy manner.

Semi-dynamic backend coder for data compression

Embodiments of the present inventions are related to systems and methods for data processing, and more particularly to systems and methods for recovering data where synchronization information is not detected.

Systems and methods for correlation based data alignment

A system includes a first sync mark detector circuit operable to apply a first sync mark detection algorithm to search a received media sector and overhead for a second sync mark after a failure to identify a first sync mark. A second sync mark detector circuit operable to apply a second sync mark detection algorithm to search the received media sector and overhead for the second sync mark. An anchor point identification circuit identifies an anchor point in the received media sector. A retry controller circuit causes a re-read of the received media sector and overhead when the first sync mark detector circuit fails to identify the first sync mark, and aligns the received media sector to yield an aligned media sector. A data processing circuit recovers an original user data set from the aligned media sector.

Systems and methods for missed media sector alignment

An apparatus includes a storage medium operable to store a number of data tracks, a read channel circuit operable to process the data tracks read from the storage medium, and a track quality classifier circuit operable to determine a track quality metric for the data tracks read from the storage medium. The track quality metric indicates whether a corresponding one of the data tracks that has failed to successfully process in the read channel circuit can be reprocessed within a track gap period.

Track quality classifier

Embodiments of the present inventions are related to systems and methods for data processing, and more particularly to systems and methods for reducing inter-track interference in relation to processing data retrieved from a storage medium.

Systems and methods for side-track aided data recovery

An apparatus for finding a syncmark in a data sector includes a syncmark detection circuit, decoder, fragment information table and syncmark recovery circuit. The syncmark detection circuit is operable to detect a syncmark in each of a number of fragments of the data sector and to compute a syncmark quality for each of the syncmarks. The decoder is operable to apply a data decoding algorithm to encoded data for the data sector. The encoded data has start points identified by the syncmark in each of the fragments. The fragment information table stores the syncmark quality for each of the syncmarks. The syncmark recovery sweeps the start points over search ranges for selected fragments for which the syncmark detection circuit failed to detect the syncmark and which have a lower syncmark quality than others of the fragments.

Syncmark detection failure recovery system

Embodiments are related to systems and methods for data processing, and more particularly to systems and methods for calibration during data processing. As an example, a data processing system is discussed that includes a sample averaging circuit operable to average digital samples from an analog to digital converter circuit over multiple instances of an analog input to yield an X-average output, and a selector circuit operable to select one of the digital samples or the X-average output as a processing output.

Systems and methods for data retry using averaging process

Systems and method relating generally to data processing, and more particularly to systems and methods for data synchronization and detection.

Systems and methods for end of fragment marker based data alignment

A hard disk drive or other storage device comprises a storage medium, a read/write head, and read channel circuitry coupled to the read/write head. The read channel circuitry comprises a despreader configured to generate a stitched logic sector by stitching together subsectors of that logic sector that were interleaved with subsectors of other logic sectors for storage on the storage medium, and a subsector bridging control module configured to control a number of bridging bits inserted by the despreader between a given pair of adjacent subsectors of the stitched logic sector. The subsector bridging control module may be illustratively configured to cause the despreader to insert a sufficient number of bridging bits between each pair of adjacent subsectors of the stitched logic sector so as to prevent discontinuities that might otherwise arise from use of X-averaging in generation of Y samples from X samples in a retry mode of operation.

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Shanghai, China

Yuqing Yang