Method for managing data in storage device and memory system employing such a method

A memory system, comprising:

• a nonvolatile memory device comprising a plurality of memory blocks, each of which memory blocks includes a plurality of logical pages;
• and
• a controller connected to the nonvolatile memory device, wherein the controller is configured to access the nonvolatile memory device in response to a request from a host,
• wherein the memory system is configured to receive a logical page from the host and in response thereto to determine whether the received logical page is in a first state or in a second state different from the first state, wherein when the logical page is in the first state this indicates that the logical page is more frequently updated than when the logical page is in the second state,
• wherein determining whether the logical page is in the first state or in the second state comprises:
• finding a block of the storage device in which the logical page is stored and detecting a time stamp of the block and a page offset of the logical page stored in the block;
• calculating an approximate time stamp of the logical page stored in the block by using the time stamp of the block and the page offset;
• and
• determining that the logical page is in the first state if a difference between the actual time stamp and the approximate time stamp is smaller than a threshold value, and determining that the logical page is in a second state different from the first state if the difference between the actual time stamp and the approximate time stamp is larger than the threshold value.