Abstract: The present invention is to provide a method for detecting the logical address of the flash memory. At the beginning of power-on a system, the present invention is to construct a scaled factor logical/physical address mapping table (AMT) which is using a zone as an unit. The present invention utilizes the address mapping table to obtain a physical zone corresponding to the logical address and then sequentially search each block of the physical zone until to obtain the physical address corresponding to the awaited-searching logical address. Hence, the present invention can obtain an effectively balance between the process speed and the space. The present invention does not occupy too much space on the premise of keeping fast processing speed.

Abstract: The present invention directly copies and constructs a partial inverse physical/logical address mapping table via a relation between a physical address and its corresponding logical address at the beginning of turning-on the system and storing the partial inverse physical/logical address mapping table (AMT) in a random access memory (RAM). Then, the function of the memory disk device, which is composed of a counter, a comparator or other hardware, is utilized to sequentially search the partial inverse physical/logical address mapping table (AMT) in a random access memory (RAM) until to obtain the corresponding physical address to the awaited-searching logical address. Hence, the present invention can obtain an effectively balance between the process speed and the space. The present invention does not occupy too much space on the premise of keeping fast processing speed.