Marvell Assigned Three Patents

Reducing repeatable runout in storage systems

Marvell International, Hamilton, Bermuda, has been assigned a patent (8,369,041) developed by four co-inventors for a "method and apparatus for reducing repeatable runout in storage systems."

The co-inventors are Pantas Sutardja, Los Gatos, CA, Yuan Zheng, Fremont, CA, Yong Huan, and Qiuliang Fu, Fremont, CA.

The abstract of the patent published by the U.S. Patent and Trademark Office states: "A storage system includes a first buffer configured to store a first repeatable runout profile (RRP) for a sector of a rotating storage medium. A second buffer is configured to store a second RRP for the sector. A controller: controls a servo of the rotating storage medium based on the first RRP during a first revolution of the rotating storage medium; and learns the second RRP (i) while operating in a track-following mode, and (ii) during the first revolution. The controller ceases learning of the second RRP when one of (i) the controller is operating in a seek mode and (ii) the rotating storage medium is in an off-track state. Subsequent to the first revolution of the rotating storage medium and based on whether the learning of the second RRP was stopped during the first revolution, the controller replaces the first RRP with the second RRP in the first buffer."

The patent application was filed on Feb. 20, 2012 (13/400,386).

Implementing RAID in solid state memory

Marvell International, Hamilton, Bermuda, has been assigned a patent (8,402,217) developed by Gregory Burd, San Jose, CA, for "implementing RAID in solid state memory."

The abstract of the patent published by the U.S. Patent and Trademark Office states: "The present disclosure includes systems and techniques relating to implementing fault tolerant storage in solid state memory. In some implementations, a method includes receiving data to be stored, dividing data into logical data blocks, assigning the blocks to a logical block grouping comprising at least one physical storage block from two or more of multiple solid state physical memory devices, storing the blocks in physical storage blocks, determining a code that corresponds to the persisted data, and storing the code that corresponds to the data stored in the logical block grouping. Blocks of damaged stored data may be recovered by identifying the logical data block and logical block grouping corresponding to the damaged physical storage block, reading the data and the code stored in the identified grouping, and comparing the code to the read data other than the data stored in the damaged block."

The patent application was filed on Sept. 14, 2010 (12/881,881).

Preamp circuit including loopback mode
for storage devices

Marvell International, Hamilton, Bermuda, has been assigned a patent (8,379,341) developed by Pantas Sutardja, Los Gatos, CA, for a "preamp circuit including a loopback mode for storage devices."

The abstract of the patent published by the U.S. Patent and Trademark Office states: "A storage device preamplifier circuit including (i) a write amplifier having an input and an output, and (ii) a read amplifier has an input and an output. The storage device preamplifier circuit further includes a loopback circuit configured to selectively connect the output of the write amplifier to the input of the read amplifier."

The patent application was filed on Dec. 12, 2011 (13/323,764).