Serial flash memory: the operation speed is slow, and the data cannot be modified in a single byte. If any bit in the modified byte changes from 0 to 1, it needs to be erased page by page before writing. Before erasing the current page, you need to back up useful data. Advantages: large capacity.
Parallel flash memory: It uses 8-bit or 16-bit data bus to operate, which is relatively fast and has other characteristics similar to serial flash memory.