Patent ID: 7653796
Filing Date: 2010-01-26
Classification: G06F

Abstract:
1. A region management method of an information recording medium, the information recording medium having a data recording region for storing data and a command receiver, the data stored in the recording medium being managed as a file by a file system, the region management method comprising: dividing the data recording region into a plurality of recording regions each managed by different file systems individually; receiving a changeover command and a data read/write command, for the command receiver, from outside of the information recording medium, the changeover command specifying a region accessible from outside of the information recording medium and the data read/write command specifying a size and an offset of a region to be accessed; and selecting one of the divided recording regions according to the received changeover command, as a region accessible from outside of the information recording medium, wherein a changeover to a different divided recording region occurs under a control of the received changeover command, wherein a plurality of independent file systems areas are disposed on the information recording medium, and the information recording medium is interpreted by different devices having different file systems, wherein data interchangeability between the different devices is provided, and wherein, when a region defined by the size and the offset specified by the data read/write command received from outside of the information recording medium exceeds the selected recording region, access to the region specified by the data read/write command is rejected.