1
Karl M J Lofgren, Robert D Norman, Gregory B Thelin, Anil Gupta: Wear leveling techniques for flash EEPROM systems. Western Digital Corporation, SanDisk Corporation, Majestic Parsons Siebert & Hsue, June 27, 2000: US06081447 (339 worldwide citation)

A mass storage system made of flash electrically erasable and programmable read only memory ("EEPROM") cells organized into blocks, the blocks in turn being grouped into memory banks, is managed to even out the numbers of erase and rewrite cycles experienced by the memory banks in order to extend th ...


2
Karl M J Lofgren, Robert D Norman, Gregory B Thelin, Anil Gupta: Wear leveling techniques for flash EEPROM systems. SanDisk Corporation, Western Digital Corporation, Parsons Hsue & de Runtz, February 1, 2005: US06850443 (292 worldwide citation)

A mass storage system made of flash electrically erasable and programmable read only memory (“EEPROM”) cells organized into blocks, the blocks in turn being grouped into memory banks, is managed to even out the numbers of erase and rewrite cycles experienced by the memory banks in order to extend th ...


3
Karl M J Lofgren, Robert D Norman, Gregory B Thelin, Anil Gupta: Wear leveling techniques for flash EEPROM systems. SanDisk Corporation, Western Digital Corporation, Parsons Hsue & de Runtz, July 15, 2003: US06594183 (265 worldwide citation)

A mass storage system made of flash electrically erasable and programmable read only memory (“EEPROM”) cells organized into blocks, the blocks in turn being grouped into memory banks, is managed to even out the numbers of erase and rewrite cycles experienced by the memory banks in order to extend th ...


4
Karl M J Lofgren, Jeffrey Donald Stai, Anil Gupta, Robert D Norman, Sanjay Mehrotra: Device and method for controlling solid-state memory system. SanDisk Corporation, Western Digital Corporation, Parsons Hsue & de Runtz, March 30, 2004: US06715044 (228 worldwide citation)

A memory system includes an array of solidstate memory devices which are in communication with and under the control of a controller module via a device bus with very few lines. This forms an integrated-circuit mass storage system which is contemplated to replace a mass storage system such as a disk ...


5
Russell A Billings, Kim Edward Russell: Disk drive having two tiered defect list comprising marginal and reserved data sectors. Western Digital Corporation, Milad G Shara, April 24, 2001: US06223303 (201 worldwide citation)

The present invention provides a method of operating a disk drive having data sites on a disk for recording data thereon. The disk drive is connectable to a host computer and maintains a defect table comprising defective sites reportable to the host computer. The method includes the step of discover ...


6
Raffi Codilian, Timothy Elliott: Disk drive with calibration bursts that are recorded on a spiral and method of recording the same. Western Digital Corporation, Milad G Shara, July 18, 2000: US06091564 (186 worldwide citation)

A disk drive with a disk having a servo pattern including a special "calibration track" wherein a plurality of calibration burst pairs are recorded on a spiral centerline to define null points that are radially shifted from a burst pair centerline by precise, predefined or subsequently measured, fra ...


7
Robert Leslie Cloke, Patrick James Lee: Hard disk drive having a built-in self-test for measuring non-linear signal distortion. Western Digital Corporation, Milad G Shara, March 27, 2001: US06208477 (162 worldwide citation)

In a hard disk drive, a semiconductor chip includes a circuit used in a built-in self test (“BIST”) to determine an amplitude of a dibit echo for characterizing nonlinear distortion of a readback signal. Preferably, write precompensation is performed based on results of the BIST to minimize distorti ...


8
Michael Scott Hicken, Steven M Howe, Daniel John Sokolov, Timothy Swatosh, Jeffrey L Williams: Disk drive cache system using a dynamic priority sequential stream of data segments continuously adapted according to prefetched sequential random, and repeating types of accesses. Western Digital Corporation, Leo J Young Esq, Milad G Shara Esq, July 18, 2000: US06092149 (160 worldwide citation)

A magnetic disk drive with a caching system includes an intelligent interface to communicate with a host, a magnetic disk and a cache memory to buffer data transferred to and from the host. The caching system maximizes drive performance based on past access history. The caching system alters executi ...


9
Robert Leslie Cloke, Richard W Hull, Vafa James Rakshani, David Price Turner: Disk drive employing state variable trap registers for providing stored servo and user data state variables to sampled-data channel. Western Digital Corporation, Milad G Shara, January 23, 2001: US06178056 (156 worldwide citation)

A disk drive includes a disk surface having a plurality of tracks arranged in an embedded servo format including servo track segments for storing servo data and data track segments for storing user data. The disk drive includes a read element operative during a user-data read operation for reading d ...


10
Karl M J Lofgren, Gerald W Shearer, Kenneth W Ouyang: Phase-locked loop delay line. Western Digital Corporation, Horn Jubas & Lubitz Spensley, May 1, 1990: US04922141 (155 worldwide citation)

A circuit for providing precise delays includes a phase-locked loop driven by a reference frequency source such as a crystal oscillator and including a variable delay circuit. The output of the oscillator is applied to the delay circuit and the non-delayed and delayed signals are compared in a phase ...