ACCESS DEVICE, COMMUNICATION EQUIPMENT, COMMUNICATION SYSTEM, AND METHOD FOR ACCESSING DATA

摘要

An access device (150) comprises a memory (103), a first controller (107) that sends and receives, via a communication line (106), a data control right that is an exclusive right to execute the reading or writing of data stored in the memory (103), and a second controller (105) that acquires or releases the data control right according to a command from the first controller (107), and writes to the memory (103) the data that is transferred from a data recording device (201) while holding the data control right. The first controller (107) releases the data control right to the second controller (105) when having received a request to interrupt the transfer of the data while data is being transferred from the data recording device (201), and if it is determined that mismatching has occurred in management information for the data with that of the data recording device (201), returns the data control right to the second controller (105). The second controller (105) releases the data control right after eliminating the mismatching of management information according to the returned data control right.