Abstract: In accordance with an embodiment of the present invention, control device and method are disclosed for reducing unnecessary data backup and restoring operations and increasing data read and write speed in a flash memory. The method includes writing data received from the host system to the flash memory; moving valid data in the basic block to the first link block when a use ratio of the first link block is greater than a reference value; and moving valid data in the first link block to the second link block when a use ratio of the first link block is less than the reference value.

Abstract: In accordance with an embodiment of the present invention, control device and method are disclosed for reducing unnecessary data backup and restoring operations and increasing data read and write speed in a flash memory. The method includes writing data received from the host system to the flash memory; moving valid data in the basic block to the first link block when a use ratio of the first link block is greater than a reference value; and moving valid data in the first link block to the second link block when a use ratio of the first link block is less than the reference value.