Nonvolatile memory system for improving stream data writing

An access device that writes and reads data to and from a nonvolatile memory device, the access device being configured to transmit to the nonvolatile memory device a first command that includes identification information for identifying a first write range for writing data, and after transmitting the first command, transmit plural second commands to the nonvolatile memory device, each of the second commands including identification information for identifying a second write range that is a part of the first write range identified by the first command and orders to write data to the second write range so as to write the data sequentially from beginning of the first range identified by the first command.

A memory controller that controls data writing and reading to and from a nonvolatile memory, comprising:

• 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 identified by the first command and orders to write data to the second write range so as to write the data sequentially from a beginning of the first range identified by the first command;
• and
• a read/write control unit configured to write data to the nonvolatile memory in response to the second command.