MEMORY CONTROLLER, NONVOLATILE MEMORY DEVICE, FILE SYSTEM, NONVOLATILE MEMORY SYSTEM, DATA WRITING METHOD AND DATA WRITING PROGRAM

摘要

A file system (105) and a nonvolatile memory device (101) notify each other of their cluster size and logic block size in advance. In writing, the file system notifies the nonvolatile memory device of data as to which cluster of the file system can be discarded in the logic block of the nonvolatile memory device. With this, the nonvolatile memory device can avoid the copy of data at the writing, so that the nonvolatile memory device is not required to continuously keep data of an unnecessary file.