Patent ID: 7684299

Claim:
A control apparatus for controlling a drive apparatus to access a rewritable information recording medium using a first file system, wherein the information recording medium has a data recording area in which data can be recorded, a first file system space and a second file system space are defined on the data recording area, the first file system space can be used to record data using a first file system, the second file system space can be used to record data using a second file system which is different from the first file system, and the first file system space is included in the second file system space, the control apparatus comprising: a first determination means for determining whether or not a matter which is not permitted in the second file system exists on the information recording medium; and a second determination means for determining that there is a possibility that the valid data in the first file system is recorded in the first file system space when it is determined that a matter which is not permitted in the second file system exists on the information recording medium.