Magnetic disk device
AssigneesKabushiki Kaisha Toshiba, Toshiba Electronic Devices & Storage Corporation
InventorsNobuyuki Sakamoto, Isamu Tomita
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Abstract
According to one embodiment, a magnetic disk device includes a first magnetic disk, a second magnetic disk, a first actuator with a first head which reads/writes data from/to the first magnetic disk, a second actuator with a second head which reads/writes data from/to the second magnetic disk, the second actuator operated independently from the first actuator, a first controller configured to retracts the first actuator at a first time, and a second controller configured to retract the second actuator at a second time which is shifted from the first time by a certain period of time.
Claims10
A magnetic disk device, comprising:
- a first magnetic disk;
- a second magnetic disk;
- a first actuator with a first head which reads/writes data from/to the first magnetic disk;
- a second actuator with a second head which reads/writes data from/to the second magnetic disk, the second actuator operated independently from the first actuator;
- a first controller configured to retract the first actuator at a first time;
- and
- a second controller configured to retract the second actuator at a second time which is shifted from the first time by a certain period of time, wherein
- the certain period of time is a period of time when the retraction of the first actuator from the first magnetic disk is completed.
A magnetic disk device, comprising:
- a first magnetic disk;
- a second magnetic disk;
- a first actuator with a first head which reads/writes data from/to the first magnetic disk;
- a second actuator with a second head which reads/writes data from/to the second magnetic disk, the second actuator operated independently from the first actuator;
- a first controller configured to retract the first actuator at a first time;
- a second controller configured to retract the second actuator at a second time which is shifted from the first time by a certain period of time;
- and
- a spindle motor configured to operate the first actuator and the second actuator, wherein
- the first controller and the second controller retract the first actuator and the second actuator respectively when the power is shut down, and upon detection of the shutdown of the power, the first controller retracts the first actuator based on a back electromotive force of the spindle motor, and the second controller retracts the second actuator based on the back electromotive force of the spindle motor.
A magnetic disk device, comprising:
- a first magnetic disk;
- a second magnetic disk;
- a first actuator with a first head which reads/writes data from/to the first magnetic disk;
- a second actuator with a second head which reads/writes data from/to the second magnetic disk, the second actuator operated independently from the first actuator;
- a first controller configured to retract the first actuator at a first time;
- and
- a second controller configured to retract the second actuator at a second time which is shifted from the first time by a certain period of time, wherein
- the first controller and the second controller are different controllers, and the first controller and the second controller are connected,
- the first controller transmits a signal indicative of completion of the retraction of the first actuator to the second controller, and
- the second time when the second controller starts the retraction of the second actuator is a time when the second controller receives the signal from the first controller.
Dependencies are inferred from the claim text.