Kabushiki Kaisha Toshiba

Fujitsu Corporation

Kiyotaka Sasaki

Yasuyuki Nagashima

Masakazu Kitahara

Michio Yamamoto

Keiichi Yorimitsu

Seiji Toda

Hironori Kanno

Nobuhiro Sugawara

Takumi Kakuya

Kenji Inoue

Michihiko Umeda

Masataka Shitara

Isao Fujita

Satoru Adachi

According to one embodiment, a controller of a magnetic disk device starts to receive first data specified in a first write command from a host, and starts to write the first data to a disk in accordance with the first write command. The controller reports a status for execution of the first write command to the host depending on whether or not a second capacity of data not yet written to the disk is less than or equal to a first capacity of a first free space in a nonvolatile cache. The first free space is available to save data during a first period when a backup power supply enables power to be supplied. The second capacity decreases as writing of the first data to the disk progresses.

Magnetic disk device and method for executing write command

According to one embodiment, a read/write apparatus includes a receiver and a refresh module. The receiver receives a write command requesting a write to a magnetic disk. The refresh module refreshes, when a first area of the magnetic disk includes a second area corresponding to the write command, data written in a third area, the third area being an area obtained by excluding the second area from the first area.

Read/write apparatus and read/write method

To provide a medium scan method which can be executed for a suitable region at suitable timing, a disk device comprises a storage medium for storing information, a writing unit for writing information to the storage medium by request from an upper device such as a host computer or the like, a medium monitoring unit for monitoring the state of the storage medium, and a medium scan determining unit for determining whether or not to require medium scan for the storage medium.

Medium scan method for use in disk device

A magnetic disk device has an improved seek control in which a waiting time occurred in a first magnetic head while it is scanning a first track, is utilized efficiently and effectively by activating a second magnetic head such that the second magnetic head scans a second track during the waiting time of the first magnetic head.

Magnetic disk device having an improved seek control

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Kawasaki, Japan

Kiyotaka Sasaki