Kabushiki Kaisha Toshiba

Toshiba Electronic Devices & Storage Corporation

Kimiyasu Aida

Katsushi Ohta

Kazuya Takada

Takumi Kakuya

Hidekazu Masuyama

Kenji Inoue

Yuji Karakawa

Takato Kuji

Hirotaka Iima

According to one embodiment, a magnetic disk device incudes a first magnetic disk, a first actuator that reads/writes data from/to the first magnetic disk, a first controller that controls the first actuator, a second magnetic disk, a second actuator that reads/writes data from/to the second magnetic disk, a second controller that controls the second actuator, wherein the first controller executes read/write processing, and the second controller stores trace data of the read/write processing when the first controller executes the read/write processing.

Magnetic disk device stored trace data of the read/write processing

According to one embodiment, a disk medium rotates in a first rotation state when access is given, and rotates in a second rotation state lower in rotation number than the first rotation state when access is not given. A controller receives, from a host device, a read command for reading first data stored in a first buffer, when the disk medium is in the second rotation state. The controller transmits the first data from the first buffer to the host device, without causing a shift into the first rotation state, and then shifts the disk medium into the first rotation state after completion of execution of the read command.

Disk device and disk device control method

Growing community of inventors

Kawasaki Kanagawa, Japan

Kimiyasu Aida