Magnetic disk device
AssigneeFujitsu Limited
InventorMasakazu Kawamoto
Life of this patent
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Abstract
A magnetic disk sub-system composed of a plurality of magnetic disk drives comprises a rotation synchronizing control circuit, where the rotations of the spindle motors of a plurality of magnetic disk drives are synchronized. By distributing/allocating a data position to a different address on each drive, rotations can be synchronized, and if the data is read from a head, the concurrence of a plurality of segments of data transfer can be prevented by shifting the timing in which the data is actually read from each disk.
Claims10
A magnetic disk device composed of a plurality of magnetic disk drives, comprising:
- a synchronizing unit synchronizing rotations of motors of the plurality of magnetic disk drives;
- and
- a data storage unit shifting the data storage position of each magnetic disk in such a way that data can be read from each magnetic disk at different timings when the data is read from the magnetic disk;
- and storing the data, wherein
- the buffer capacity of each magnetic disk drive is reduced by reducing the waiting time for reading data from each magnetic disk and also by preventing any excessive amount of data transfer for each time that the capacity of the data transmission line is exceeded.
A control method for a magnetic disk device with a plurality of magnetic disk drives, comprising:
- synchronizing rotations of motors of the plurality of magnetic disk drives;
- and,
- shifting the data storage position for each magnetic disk in such a way that data can be read from each magnetic disk at different timings when data is read from the magnetic disk and storing the data, wherein the buffer capacity of each magnetic disk drive is reduced by reducing the waiting time for reading data from each magnetic disk and preventing any excessive amount of data transfer at any particular time from exceeding the capacity of the data transmission line.
Dependencies are inferred from the claim text.