| 摘要 |
PURPOSE:To prevent the disturbance to a storage area, and to virtually use the titled device as plural sets of devices, by setting a volume table of contents in accordance with each area which is divided, of a secondary storage area, and generating a management table in which a logical device number, an address of the volume table of contents, etc. are allowed to correspond. CONSTITUTION:An input/output device 3 to which write of an updated volume table of content VTOC1 is requested searches a device management table 4 and obtains a corresponding physical device number MSO1 of a delivered logical device LDN1, writes the updated volume table of contents VTOC1 from an address ADRR1 of a magnetic disk device 1 shown by the number MSO1, and ends an assignment of a file A subsequently, the device 3 reads the stored volume table of contents VTOC1 from the address ADDR1 of the magnetic disk device 1 shown by the number MSO1. Next, by checking the volume table of contents VTOC1 and knowing an assigned place of the file A in an area 11, write of a data is executed to the file A. Read of the data of this file A is also executed in the same way as its write.
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