US Patent 10261721 Memory system and operating method thereof

A memory system includes a first flash memory, a second flash memory and a controller. The first flash memory includes a memory array divided into a plurality of pages. The controller is coupled to the first flash memory and the second flash memory and configured to: control the second flash memory to record an address of a particular page in the first flash memory before programming the particular page; and control the second flash memory to record a program status of the particular page after the particular page has been programed.