Magnetic disk device
AssigneesKabushiki Kaisha Toshiba, Toshiba Electronic Devices & Storage Corporation
InventorKoji Ishii
Life of this patent
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Abstract
A magnetic disk device includes a control circuit, and a disk unit including a plurality of magnetic disks, a plurality of magnetic heads configured to read or write data from or to the magnetic disks, a first actuator configured to move the magnetic heads, a plurality of second actuators each configured to move the corresponding magnetic head, and a switch circuit configured to connect the control circuit and one of the second actuators. The control circuit is configured to transmit to the disk unit an instruction in which one of the magnetic heads is specified, control one of the second actuators corresponding to the specified magnetic head to move the magnetic head via the switch circuit, and based on a signal from the one of the second actuators, determine whether an error occurs in the one of the second actuators.
Claims20
A magnetic disk device comprising:
- a first control circuit;
- and
- a disk unit connectable to the first control circuit via a connector and comprising
- a plurality of magnetic disks,
- a plurality of magnetic heads configured to read or write data from or to the magnetic disks,
- a first actuator configured to move the magnetic heads,
- a plurality of second actuators each configured to move the corresponding magnetic head, and
- a second control circuit that includes:
- a switch circuit configured to connect the first control circuit and one of the second actuators via the connector, and
- a measurement circuit configured to measure electrical characteristics of one of the second actuators upon receipt of a signal from the second actuator, wherein
- the first control circuit is configured to
- transmit to the disk unit via the connector an instruction in which one of the magnetic heads is specified,
- control one of the second actuators corresponding to the specified magnetic head to move the magnetic head, via the switch circuit, and
- based on electrical characteristics of the one of the second actuators measured by the measurement circuit, determine whether an error occurs in the one of the second actuators.
A magnetic disk device comprising:
- a first control circuit;
- and
- a plurality of disk units each connectable to the first control circuit via a connector and comprising
- a plurality of magnetic disks,
- a plurality of magnetic heads configured to read or write data from or to the magnetic disks,
- a first actuator configured to move the magnetic heads,
- a plurality of second actuators each configured to further move one of the magnetic heads, and
- a second control circuit that includes:
- a switch circuit configured to connect the first control circuit and at least one of the second actuators via the connector, and
- a measurement circuit configured to measure electrical characteristics of one of the second actuators upon receipt of a signal from the second actuator, wherein
- the first control circuit is configured to
- transmit to one of the disk units via the connector an instruction in which one of the magnetic heads is specified,
- control one of the second actuators corresponding to the specified magnetic head to move the magnetic head, via the switch circuit, and
- based on electrical characteristics of the one of the second actuators measured by the measurement circuit, determine whether an error occurs in the one of the second actuators.
Dependencies are inferred from the claim text.