A method for managing a memory apparatus including at least one non-volatile (NV) memory element includes: recording valid/invalid page position information of at least one block; and moving valid data contained in at least a valid page of the block according to the valid/invalid page position information; where the block is an erasing unit. For example, the valid/invalid page position information may contain relative position information of the valid data in the block. More particularly, the valid/invalid page position information may contain a plurality of bits, the ranking of each bit may represent a page address offset of each page within the block, and each bit may respectively indicate whether each page in the block is valid or invalid.