Kabushiki Kaisha Toshiba

Masahide Kanegae

Masayuki Takagishi

Katsuhiko Koui

Kenichiro Yamada

Naoki Tagami

Takayuki Kawabe

Yasuyuki Nagashima

Keiichi Yorimitsu

Seiji Toda

Hironori Kanno

Kotaro Yamamoto

Toru Ezawa

Nobuhiro Sugawara

Shuichi Kojima

According to one embodiment, a drive array apparatus includes a plurality of data storage drives constituting a drive array and a controller. The controller divides all data storage areas of each of the data storage drives into a plurality of logical unit areas and associates and manages each of the logical unit areas and each of the data storage drives. The controller identifies a logical unit area of an error occurrence object based on a notification from a data storage drive where an error occurred, restores data of the identified logical unit area, and performs reconfiguration processing of the drive array.

Drive array apparatus, controller, data storage apparatus and method for rebuilding drive array

In a disk apparatus, media include first and second surfaces having first and second servo patterns which are read at different timings by first and second heads. A controller controls the first head based on a first demodulated position obtained by demodulating the first servo pattern and a target position. The controller calculates a first estimated demodulated position from the demodulated position and a first demodulated velocity based on the first servo patterns, calculates a second estimated demodulated position from the first demodulated position and a second demodulated velocity based on the second servo patterns, and stops writing operation of the first head in accordance with one of the first and second estimated demodulated positions exceeding a threshold.

Magnetic disk apparatus and off-tracking detection method

According to at least one embodiment, a read/write apparatus includes a read module and a positioning module. The read module reads data of a predetermined data track using a read head. The positioning module positions the read head in accordance with an index indicating how much the read head reads data of a neighboring data track of the predetermined data track when the read head reads data of the predetermined data track.

Read/write apparatus and read/write method

According to one embodiment, an apparatus for controlling a head includes a transmitting module and a controller. The transmitting module is configured to transmit a write signal to a magnetic head having a spin torque oscillator at the time of recording data. The controller is configured to supply a drive signal that has a level higher than the ordinary level for a prescribed effective time, to the spin-torque oscillator in response to an input write gate that instructs the recording of data. During a period other than prescribed effective time, the controller supplies a drive signal having the ordinary level to the spin-torque oscillator.

Method and apparatus for controlling head with spin-torque oscillator in a disk drive

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Fujisawa, Japan

Masahide Kanegae