LSI (Avago) Assigned Five Patents

Two dimensional magnetic recording servo system adaptive combination
LSI Corp., San Jose, CA, has been assigned a patent (8,837,068) developed by four co-inventors for a “two dimensional magnetic recording servo system adaptive combination.”

The co-inventors are Yu Liao, Jeffrey P. Grundvig, Longmont, CO, Jin Lu, Lafayette, CO, and Richard Rauschmayer, Longmont, CO.

The abstract of the patent published by the U.S. Patent and Trademark Office states: “A servo system includes multiple interpolators operable to interpolate equalized data for multiple signal paths in a two dimensional magnetic recording system to yield interpolated signals at different phases, scaling circuits operable to scale the interpolated signals by adaptive scaling factors, a signal combining circuit operable to combine the scaled signals, a phase tracking circuit operable to select one of the phases of the combined signal, and an error gradient circuit operable to adapt the adaptive scaling factors.”

The patent application was filed on April 23, 2014 (14/259,424).

Hardware-based inter-track interference mitigation
in magnetic recording systems with read channel storage of cancelation data
LSI, San Jose, CA, has been assigned a patent (8,830,612) developed by Kurt J. Worrell, Berthoud, CO, and Erich F. Haratsch, Bethlehem, PA, for “hardware-based inter-track interference mitigation in magnetic recording systems with read channel storage of cancelation data.”

The abstract of the patent published by the U.S. Patent and Trademark Office states: “Hardware-based methods and apparatus are provided for inter-track interference mitigation in magnetic recording systems. Inter-track interference (ITI) cancellation data is stored in a memory of a read channel of a magnetic recording system. The memory can be in a write data path or a read data path of the read channel. The inter-track interference cancellation data is optionally provided to an inter-track interference mitigation circuit using at least a portion of a write data path, for example, based on a control signal. The storage of the inter-track interference cancellation data can be in response to a second control signal.“

The patent application was filed on April 30, 2012 (13/460,204).

Disk-based storage device with frequently accessed partition
LSI, San Jose, CA, has been assigned a patent (8,832,410) developed by David M. Springberg, Fort Collins, CO, for a “disk-based storage device with frequently accessed partition.”

The abstract of the patent published by the U.S. Patent and Trademark Office states: “A HDD drive or other disk-based storage device comprises a storage disk, a R/W head configured to read data from and write data to the storage disk, and a controller configured to process data received from and supplied to the R/W head and to control positioning of the R/W head relative to the storage disk. The storage disk is partitioned into at least first and second regions, with the first region having a substantially higher average data transfer rate than the second region and being utilized to store data that is accessed more frequently than data stored in the second region. In one embodiment, the data stored in the first region is not stored in the second region or in any other region of the storage disk, and is randomly distributed across a plurality of sectors of the first region. The first region may comprise one or more outer annular zones of the storage disk and the second region may comprise one or more inner annular zones of the storage disk.”

The patent application was filed on April 28, 2011 (13/096,698).

Storage media iner-track interference cancellation
LSI, Milpitas, CA, has been assigned a patent (8,830,613) developed by seven co-inventors for the “storage media iner-track interference cancellation.”

The co-inventors are Timothy B. Lund, Carl E. Forhan, Timothy W. Swatosh, Rochester, MN, Erich Franz Haratsch, Bethlehem, PA, George Mathew, San Jose, CA, Ming Jin, Fremont, CA, and Jongseung Park, Allentown, PA.

The abstract of the patent published by the U.S. Patent and Trademark Office states: “Described embodiments provide a method of cancelling inter-track interference (ITI) from one or more sectors read from a desired track of a storage medium. A read channel reads sectors in a desired track of the storage medium. An iterative decoder of the read channel decodes the read sectors, and if the read sectors are incorrectly recovered from the storage medium, selected sectors of a first adjacent track are read. An ITI canceller of the read channel estimates ITI in the read sectors of the desired track corresponding to the selected sectors of the adjacent track and subtracts the estimated ITI of the adjacent track from the data for the sectors of the desired track, providing updated sector data. The ITI cancelled data is replayed to the iterative decoder, which decodes the ITI cancelled data and provides the decoded ITI cancelled data as output data of the read channel.”

The patent application was filed on Aug. 22, 2012 (13/591,980).

Optimizing wide port power management in SAS topology
LSI, San Jose, CA, has been assigned a patent (8,843,666) developed by five co-inventors for a “method for optimizing wide port power management in a SAS topology.”

The co-inventors are Brad Besmer, Brian A. Day, Scott Dominguez, CO Springs Springs, CO, Kevin A. Mocklin, Mansfield, MA, and David J. Golden, Millville, MA.

The abstract of the patent published by the U.S. Patent and Trademark Office states: “A SAS expander or initiator places PHYs in a wide port into a persistent reduced power state by signaling to the connected SAS device that the SAS expander or initiator intends to route data traffic through other PHYs in the wide port. The SAS expander or initiator and connected SAS device agree to disuse certain PHYs so that the PHYs enter a reduced power state according to SAS standards.”

The patent application was filed on March 2, 2012 (13/410,374).