| 摘要 |
PURPOSE:To reduce the capacity of a sub-file, and to secure the maintainability of a data, by referring to a corresponding table to end write of a main file data, and subsequently writing a double write data in this data buffer device in a corresponding storage area of the sub-file. CONSTITUTION:A positioning control part 3 retrieves a corresponding table in a floppy disk device 4, by a discriminating signal applied from a channel interface control part 2, and sets main file information and sub-file information to a register A5 and a register B6, respectively. Subsequently, when a positioning completion interruption of the main file side is detected, the control part 3 transfers the control to a data control part 10. Thenafter, a main file data from a channel 1 is written in a main file volume 8 through a device control part 7. In this period, the control part 10 refers to the main file information in the register A5, and discriminates a double write data to a track of a double write object. Subsequently, when this data is detected, the control part 10 actuates a buffer control part 11. |
