DEVICE AND METHOD FOR MANAGING BUFFER OF SERIAL MEDIUM DATA STORING DEVICE

摘要

PURPOSE: A device and method for managing a buffer of serial medium data storage is provided to supply a phase difference buffer changing method for decreasing the number of accesses to the lower disk by managing an access phase of a user who is using serial medium data and enhancing a reusing rate of a buffer block using the phase. CONSTITUTION: A data block is stored actually at a buffer area(201) in a main memory(101). A PCB(Phase Control Block)(202) stores phase managing information for managing a phase of a user. A PDB(Phase Difference Block)(203) stores information of a phase difference between adjacent users for changing a buffer. An SRB(Select Replacing Block)(204) stores information which sorts the PDB(203). A buffer manager stores new data by selecting a data block in a conventional main memory buffer area(101) as a sacrifice for appropriating a necessary buffer area(201) in accordance with a user's connection according to the SRB(204). New data refer to the phase of the user, and transmit information to a disk storage control information(205). A disk storage(102) stores the data block in a disk storage buffer area(206). The data block is transmitted from the main memory buffer area(101) to the buffer area(201) for temporarily storing a video data block through the main memory buffer area(101) of a serial medium data server and a video terminal(105) for receiving and outputting video data from the serial medium data server. If a data block is existed in the buffer area, an access to the disk storage(102) is not necessary.