简介: Introduction:Flash is a non-volatile form of memory: it retains its information even when powered down. It can be erased and reliably re-written over thousands or even millions of cycles. Unlike an EEPROM, only a small portion of the memory needs to be erased when being overwritten. There are two sub-categories of flash memory: NAND is higher density and more economical while NOR is faster and better suited for random access. Flash memory has become ubiquitous within the last decade. Consumer el