The invention introduces an apparatus for generating a storage mapping table at least including a direct memory access controller for reading first physical location (PL) address corresponding to a logical location of the storage mapping table; an expanding circuit for obtaining the first PL address and expanding the first PL address into second PL address by appending data bits that originally provide different information from a physical address of the flash memory unit to the first PL address; and a controller for transmitting the second PL address without transmitting the first PL address stored in the flash memory unit to a host.