Western Digital Technologies, Inc.

Seagate Technology Incorporated

Skyera, LLC

Nortel Networks Corporation

Jack W Flinsbaugh

Rodney Norman Mullendore

Andrew John Tomlin

Justin Cree Jones

Monty Aaron Forehand

Clyde Everett Goodner, Iii

Justin M Jones

Ronald D Metzner

Gopinath K Bendigeri

A method of merging data frames includes: receiving a first data frame having a plurality of sectors; receiving a second data frame having a plurality of sectors; generating a merged output data frame by merging, using a plurality of data paths including a plurality of multiplexers, sectors of the second data frame with sectors of the first data frame; and performing an error check on at least one check-data frame having sectors corresponding to those in the first data frame or the second data frame, where at least some of the sectors in the check-data frame are transmitted on a subset of the plurality of data paths that transmits sectors of the merged output data frame, and where the error check verifies the merged output data frame.

High performance read-modify-write system providing line-rate merging of dataframe segments in hardware

A method of writing data to a range of logical blocks in a storage medium includes: receiving a command including a starting logical block address, a value indicating a range of logical block addresses to be written, and a logical block of data; storing the logical block in a first temporary storage; generating a logical page by duplicating the logical block a plurality of times corresponding to a number of logical blocks in a logical page and transporting the generated logical page to a second temporary storage and storing the generated logical page in the second temporary storage; writing the generated logical page from the second temporary storage into the storage medium beginning from the starting logical block address; and performing a read-modify-write operation if the first write operation does not begin on a logical page boundary or the last write operation does not end on a logical page boundary.

High performance system for selective merging of dataframe segments

High performance system providing selective merging of dataframe segments in hardware

An apparatus and method for providing a translation layer between a local bus and a global bus is described. The apparatus has a local bus and a global bus respectively coupled to a local bus gateway and a global bus gateway. A storage unit is coupled to both of the gateways, the storage unit having a traffic unit. Traffic control logic is coupled to at least one of the gateways and to at least one traffic statistic register.

High performance system and method having a local bus and a global bus

Apparatus and method for dynamically programming the magnitude of read bias and write currents in a disc drive head (,A,,B). A digital input value is provided to a register (,) of a digital to analog converter (,), the digital input value indicative of the desired magnitude of the head current. A multiplier (,) of the digital to analog converter (,) multiplies the digital input value by a reference voltage to generate an output voltage. The differential voltage between the reference voltage and the output voltage controls the source to drain resistance of a transistor (,) connected in series with a preamp voltage source (,) of a preamp circuit (,). By inputting different digital input values, the source to drain resistance of the transistor (,), and hence the magnitude of the current generated by the preamp voltage source (,), are precisely controlled. The magnitude of the head current is provided as a multiple of the magnitude of the current generated by the preamp voltage source (,). During a read operation, the read bias current is provided to the head (,A,,B) and the effects of flux transitions on the read bias current are decoded by a read channel (,) to retrieve the data stored on the disc drive. During a write operation, the polarity of the write current is controlled by a write channel circuit (,) operating in conjunction with the preamp circuit (,) to write the data to the disc (,A,,B).

Dynamically programmable magneto-resistive head write and read bias currents

Dynamically programmable magneto-resistive head write and read bias

A temperature sensing system for use in a computer disc drive comprises a themoelectric sensor having an output sensor voltage which is variable as a function of temperature, an interface circuit adapted to receive the output sensor voltage from the thermoelectric sensor and adapted to generate a scaled and level-shifted analog output voltage signal, and an analog-to-digital converter circuit adapted to receive the analog output signal voltage from the interface circuit and convert the analog output signal voltage into a digital signal which is compared to various defined thresholds.

Thermoelectric temperature sensing system in a computer hard disc drive

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San Jose, CA, United States of America

Jack W Flinsbaugh