Kabushiki Kaisha Toshiba

Toshiba Electronic Devices & Storage Corporation

Naota Muguruma

Kenji Yoshida

Kazuya Takada

According to one embodiment, a magnetic disk device includes a magnetic disk, an actuator, a nonvolatile memory, and a controller. When a first determination condition of whether a total value of an amount of data for which execution completion has not been notified in one processing thread that executes a write command, the data having not been written to the magnetic disk, and an amount of the data for which execution completion has been notified in another processing thread that executes the write command, the data having not been written to the magnetic disk, is less than or equal to a capacity of the nonvolatile memory holds, the controller notifies the host of execution completion of the write command in the one processing thread.

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Yokohama Kanagawa, Japan

Naota Muguruma