Patent ID: 8904142

Claim:
A memory system configured to be coupled to a host, the memory system comprising: a first nonvolatile storage device; a second nonvolatile storage device, a memory capacity of the second nonvolatile storage device being smaller than a memory capacity of the first nonvolatile storage device, the second nonvolatile storage device being a different type of memory than the first nonvolatile storage device; and a controller configured to receive first data and a request for writing the first data from the host, the controller being configured to perform in response to the request: writing the first data to the second nonvolatile storage device; reading the first data from the second nonvolatile storage device; reading second data from the first nonvolatile storage device; and writing the read first and second data to the first nonvolatile storage device, wherein: a plurality of logical sector addresses are assigned to a storage region of the memory system, the memory system is configured to store management information and file data, the management information indicates which ones of the logical sector addresses are allocated to store the file data, and the management information is accessible from the host; and the first and second data are associated with consecutive addresses which are included in the logical sector addresses.