Memory apparatus and data access method thereof by using multiple memories for lifetime extension

A data access method of a memory apparatus, wherein the memory apparatus comprises a first memory unit and a second memory unit, the first memory unit comprises a plurality of physical memory pages, and a data access speed of the second memory unit is higher than a data access speed of the first memory unit, the data access method comprising:

• receiving write data which corresponds to a write address of the second memory unit;
• comparing the write data with a first data stored in the second memory unit and corresponding to the write address to generate a comparison result, and determining whether to execute a data writing operation according to the comparison result, wherein the data writing operation comprises writing the write data into an unwritten storage field in a current physical memory page of the first memory unit, and writing the write data into a storage field of the second memory unit corresponding to the write address;
• determining whether the current physical memory page of the first memory unit is full after executing the data writing operation;
• executing a data arranging operation on the current physical memory page according to a plurality of data in the second memory unit and corresponding to the current physical memory page when the current physical memory page of the first memory unit is full;
• and
• when receiving a read command, according to a read address in the read command, reading a second data corresponding to the read address in the second memory unit, wherein the step of executing the data arranging operation on the current physical memory page according to the plurality of data in the second memory unit and corresponding to the current physical memory page when the current physical memory page of the first memory unit is full comprises:
• selecting one of the physical memory pages to establish a replacement physical memory page, wherein the replacement physical memory page is different from the current physical memory page;
• copying at least one valid data of the plurality of data corresponding to the current physical memory page in the second memory unit to the replacement physical memory page of the first memory unit;
• and
• erasing the current physical memory page and setting the replacement physical memory page as the current physical memory page.