| 摘要 |
PURPOSE:To quickly extend a file area by copying the control information on a file area before it is extended and a data area to a new file area without destruction the contents of said control information and data area. CONSTITUTION:A file area 1a is extended to a control information area 2a and a data area 3a. The old data area 3a is copied to a new data area 3b by copying successively the contents of the area 3a to an area right after the area 3a (an area right after an address X3), for example, in the area 3b. When the contents of the area 3a are all copied to the area 3b in said process, an idle area 4 and an idle area 5 (a part of the area 3a) are produced in the area 3b as shown in a figure (c). Then the necessary processes are carried out to copy the area 2a to a new control information area 2b and an idle block is processed.
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