Method for controller flash memory module and associated flash memory controller and memory device

A flash memory controller, wherein the flash memory controller is configured to access a flash memory module, the flash memory module comprises multiple dies, each die comprises multiple blocks, and each block comprises multiple pages;

• and the flash memory controller comprises:
• a read only memory, configured to store a program code;
• and
• a microprocessor, configured to execute the program code to a control access of the flash memory module;
• wherein the microprocessor is configured to perform the steps of:
• after the flash memory module is powered on, determining whether the flash memory module encountered an abnormal power failure before the flash memory module is powered on;
• if the flash memory module encounters the abnormal power failure before the flash memory module is powered on, determining a last super block written by the flash memory module before powering on, where the super block comprises multiple first blocks respectively located in the multiple dies;
• for each first block in the super block, determining a last successfully read page of the first block;
• determining a data weak region of the super block according to the last successfully read pages of the first blocks in the super block;
• and
• moving data in the weak data region to other regions of the super block or to another super block.

A memory device, comprising:

• a flash memory module, wherein the flash memory module comprises multiple dies, each die comprises multiple blocks, and each block comprises multiple pages;
• and
• a flash memory controller, configured to access the flash memory module;
• wherein the flash memory controller is configured to perform the steps of:
• after the flash memory module is powered on, determining whether the flash memory module encountered an abnormal power failure before the flash memory module is powered on;
• if the flash memory module encounters the abnormal power failure before the flash memory module is powered on, determining a last super block written by the flash memory module before powering on, where the super block comprises multiple first blocks respectively located in the multiple dies;
• for each first block in the super block, determining a last successfully read page of the first block;
• determining a data weak region of the super block according to the last successfully read pages of the first blocks in the super block;
• and
• moving data in the weak data region to other regions of the super block or to another super block.