NAND & NOR

NOR and NAND flash differ in two important ways:
* the connections of the individual memory cells are different
* the interface provided for reading and writing the memory is different (NOR allows random-access for reading, NAND allows only page access)

NAND: the I/O interface of NAND flash does not provide a random-access external address bus, Rather, data must be read on a block-wise basis, NAND devices also require bad block management by the device driver software



http://en.wikipedia.org/wiki/Flash_memory