Patent ID: 8886912

Claim:
A method of adjusting a memory system including a memory processor and a nonvolatile memory device comprising an active memory and a reserved memory, the memory system being connected to a host, the method comprising: detecting an amount of free space of the reserved memory during an operation of the memory system; sending a result of the detecting to the host; receiving a parameter value along with a capacity adjusting command from the host; storing parameter information in the nonvolatile memory device in response to the received parameter value; reading a current mapping information from the nonvolatile memory device; constructing a new mapping information by modifying the current mapping information in response to the capacity adjusting command; and saving the new mapping information into the nonvolatile memory device, wherein the parameter value establishes a new partitioning ratio of the active memory to the reserved memory, and wherein constructing the new mapping information causes a user usable capacity of the nonvolatile memory device, as viewed by the host, to be adjusted.