Abstract: A magnetic disk apparatus includes at least two systems, each system having at least one power unit and at least one battery unit ancillary to the power unit. The disk apparatus also includes at least one common power unit having a pluralities of batteries attached thereto connected in common with the two systems. Patrol control means (PC) is operatively connected to a power control unit (0) of one system and a power control unit (1) of another system for giving a control signal during a battery monitoring operation and a priority order to the battery monitoring operation. The patrol control means monitors the function of the common batteries attached to the common power unit and, further, when the common batteries are incorporated in the magnetic disk apparatus, controls the simultaneous monitoring of the common batteries and the time of incorporation of the common batteries into the magnetic disk apparatus.

Abstract: A storage disk module includes a frame, and a disk drive unit having a storage disk. The disk drive unit is accommodated in the frame. A circuit unit controls the disk drive unit, and is accommodated in the frame. A power source supplies the disk drive unit and the circuit unit with energy. The power source is accommodated in the frame. The disk drive unit, the circuit unit and the power source are arranged side by side in the frame in a direction perpendicular to a direction in which the storage disk module is inserted into a locker. A back panel is formed in a back portion of the frame. The back panel electrically connects the disk drive unit, the circuit unit and the power source to each other.

Abstract: A magnetic disk apparatus which is used as a subsystem of a computer system, in particular a medium-sized computer system which uses commercial power and does not have its own backup power, provided with a plurality of directors (118), a plurality of magnetic disk modules (148) commonly accessed from the plurality of directors, a plurality of director batteries (114-m) for supplying power individually to the plurality of directors, magnetic disk module batteries (114-n) for supplying power to the magnetic disk modules, and a power controller (110) for independently controlling the supply of power from the plurality of director batteries and magnetic disk module batteries in accordance with the operating state of the plurality of directors and magnetic disk modules. (FIG. 1).

Abstract: A storage disk module includes a frame, and a disk drive unit having a storage disk. The disk drive unit is accommodated in the frame. A circuit unit controls the disk drive unit, and is accommodated in the frame. A power source supplies the disk drive unit and the circuit unit with energy. The power source is accommodated in the frame. The disk drive unit, the circuit unit and the power source are arranged side by side in the frame in a direction perpendicular to a direction in which the storage disk module is inserted into a locker. A back panel is formed in a back portion of the frame. The back panel electrically connects the disk drive unit, the circuit unit and the power source to each other.

Abstract: A storage disk module includes a frame, and a disk drive unit having a storage disk. The disk drive unit is accommodated in the frame. A circuit unit controls the disk drive unit, and is accommodated in the frame. A power source supplies the disk drive unit and the circuit unit with energy. The power source is accommodated in the frame. The disk drive unit, the circuit unit and the power source are arranged side by side in the frame in a direction perpendicular to a direction in which the storage disk module is inserted into a locker. A back panel is formed in a back portion of the frame. The back panel electrically connects the disk drive unit, the circuit unit and the power source to each other.

Abstract: A rotating disc device for storing digital data, comprising: a storage unit containing a spindle motor, a disc for storing digital data thereon and rotating by being driven by the spindle motor, a head for writing and reading data on the disc, and a positioning mechanism for positioning the head; a driver circuit for driving the spindle motor and the positioning mechanism; and a control circuit for controlling the storage unit. A first power supply unit for supplying electric power to the driver circuit, is positioned adjacent to the driver circuit; and a second power supply unit for supplying electric power to the control circuit, is positioned adjacent to the control circuit. Further, a first cooling fan is provided for cooling the first power supply unit, the storage unit, and the driver circuit; and a second cooling fan is provided for cooling the second power supply unit and the control circuit.