| 摘要 |
PROBLEM TO BE SOLVED: To make data for a plurality of destinations coexist in a single nonvolatile memory while maintaining a secret state.SOLUTION: A nonvolatile memory 2 includes a common partition 2a for storing a common file system and a plurality of differential partitions 2b to 2d for storing differential file systems. A destination information discrimination part 9 discriminates, for example, a destination A on the basis of destination information provided from the outside, a mounting execution part 10 selects a differential file system A to the destination A from the nonvolatile memory 2, forms an overlapping file system with a common file system and mounts the overlapping file system on a RAM 3. Thus, file systems for a plurality of destinations are made to coexist on the single nonvolatile memory 2 while maintaining secret information. |
