US Patent 7203791 Flash memory device with partial copy-back mode

The disclosure is NAND flash memory device with a partial copy-back mode, comprised of a cell array constructed of pages, a page buffer block composed of page buffers storing data in correspondence with the pages, a selection circuit for designating one or more pages to be initialized in the partial copy-back mode, and a control circuit for generating control signals to operate the page buffers and the selection circuit.