Flash memory is a non-volatile storage chip which can be erased and reprogrammed on a block basis rather than on a byte by byte basis. It can be a high density NAND type used in USB Mass storage devices, or a NOR type employed as replacements for the conventional EPROMs in the system BIOS chips. These cost far less that the other EEPROM types and are a dominant memory type where non-volatile solid state storage is required.
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