Wear-leveling nandflash memory reading/writing method

A method of writing data in a wear-leveling NandFlash memory, a storage space of the NandFlash memory including a storage information area, a file information area, a data area and a swap area, the method comprising:

• creating a new file information table in the file information area, and reading all other file information tables to determine a writing starting address of a new file;
• determining whether the writing starting address of the new file is in a starting address of a block;
• in response to the writing starting address of the new file being in the starting address of the block, erasing the block, and determining a return status of an erasure operation;
• in response to an error being returned, indicating that the block is a bad block, finding a replacement block in the swap area to replace the bad block, and updating a bad block registration table in the storage information area;
• storing to-be-written data into a data buffer of a memory;
• in response to data of one page having been stored sufficiently in the data buffer, writing the data into a block in the data area, and determining a return status of the writing;
• in response to an error being returned, indicating that the block where this page is located is a bad block, finding a replacement block in the swap area to replace the bad block, updating the bad block registration table in the storage information area, and copying contents of a current page and its previous page of the bad block into the replacement block;
• in response to the pages being successfully written, updating the file information table, which comprises file storage starting and ending addresses, file sizes and file updating time;
• repeating steps including the storing to-be-written data through the updating the file information table, until a user ends a writing operation;
• determining whether any remaining data exists in the data buffer, in response to any remaining data existing in the data buffer, writing all the data remaining in the buffer into a block in the data area;
• and
• updating the file information table.