Nonvolatile memory system for improving stream data writing

Abstract

The nonvolatile memory device prevents data writing from temporarily slowing down significantly in the middle of writing data to a block when an access device writes all the data in the block in units of a smaller size than the block. The nonvolatile memory device comprises a memory controller including an interface unit configured to receive a first command that identifies a first write range for writing data, and a second command that identifies a second write range that is a part of the first write range and orders to write data to the second write range, an address management unit configured to determine, before data is written into a nonvolatile memory, a new block for writing data to the first write range based on the first command, and a read/write control unit configured to write data to the new block in response to the second command.