| 摘要 |
PURPOSE:To prevent the destruction of information to be protected by permitting write operation only when an attribute signal due to indexing of access data in an attribute indication table as a function of an access control part and the contents of the attribute code coincide with each other. CONSTITUTION:A magnetic disc device 2 receives address data, write/read data, and a control signal in accordance with the indication from a CPU1. Only when the attribute code corresponding to the contents of information to be stored and that of a storage area to be selected by address data coincide with each other in case of access of the write operation, a write control signal is sent to a positioning part 23, and the write operation is executed. |
