Kabushiki Kaisha Toshiba

Masakazu Kitahara

Kiyotaka Sasaki

Yasuyuki Nagashima

Michio Yamamoto

Seiji Toda

Hironori Kanno

Takumi Kakuya

Nobuhiro Sugawara

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

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Kunitachi, Japan

Masakazu Kitahara