Patent ID: 8605504

Claim:
A system comprising: a memory system; and a management unit to be installed in a host with a display device to be connected to the memory system, the management unit configured to determine a state of a memory of the memory system, the memory system comprising: a first semiconductor nonvolatile memory configured to include a memory that buffers data; a second semiconductor nonvolatile memory configured to store management information of the first semiconductor nonvolatile memory; a controller configured to control the first and second semiconductor nonvolatile memories; a temperature sensor configured to detect temperature in the memory system and output temperature information; and an LED configured to indicate the status of the memory system, wherein the second semiconductor nonvolatile memory is configured to store a first information related to a total capacity of the memory of the memory system, and a second information related to a degraded state of the memory of the memory system, and the management unit is configured to calculate a ratio, that indicates the state of the memory of the memory system based on the first and second information, and configured to cause the display device to display a warning based upon a value of the ratio.