 Flash memory is embedded in ARM chips, which have sold 150billion units worldwide , and in programmable system-on-chip (PSoC) devices, which have sold 1.1billion units .This adds up to at least 151.1billion MCU and SoC chips with embedded flash memory, in addition to the 45.4billion known individual flash chip sales , totalling at least 196.5billion chips containing flash memory.Due to its relatively simple structure and high demand for higher capacity, NAND flash memory is the most aggressively scaled technology among electronic devices.