Patent ID: 8305853

Claim:
An optical disc drive device including a nonvolatile memory, comprising: cache control means, wherein if a first address specifying a sector of an optical disc, the first address to be received via a first interface, is received via the first interface, the cache control means reads out, from the nonvolatile memory, cache data having been read out from the sector and stored in the nonvolatile memory in correlation with the first address, and if the cache data cannot be thus read out from the nonvolatile memory, the cache control means receives data stored in the sector on the optical disc and writes the data in the nonvolatile memory in correlation with the first address; and data control means for (a) reading out data from the nonvolatile memory in accordance with a second address specifying an area of the nonvolatile memory, the second address received via a second interface, or (b) writing, in the nonvolatile memory, data received via the second interface, said nonvolatile memory having a first area and a second area, the first area allowing data access using the first address, the second area allowing data access using the second address, and the first address belonging to an address space different from an address space to which the second address belongs.