RECORDING MEDIUM, DATA PROCESSING APPARATUS, AND DATA PROCESSING METHOD

摘要

A nonvolatile recording area is added to a recording medium, and a host interface part, a control part and an update notification part are provided therein. The control part reads and writes data from and to the recording area, and sends the data of the recording area and update information to a data processing apparatus via the host interface part. In particular, the present invention is characterized in that just before the data of the recording area is updated, the update information of the update notification part is updated. The value of the update notification part can be referred to from the data processing apparatus but cannot be updated thereby. The data processing apparatus holds the update information of the update notification part, whereby it can determine whether the data stored in the recording area has been updated by another data processing apparatus. In this way, it becomes possible to determine the validity of the cache information and also determine that of index files.