What is NAND and NOR Flash Memories

There are two types of flash memory, NOR and NAND. The names refer to the type of logic gate used in each memory cell. (Logic gates are a fundamental building block of digital circuits). NOR flash memory was first introduced by Intel in 1988. NAND flash was introduced by Toshiba in 1989
The two chips work differently. NOR flash is faster, but it's also more expensive and takes longer to erase and write new data. NOR is most often used in mobile phones. NAND has significantly higher storage capacity than NOR. It has found a market in devices to which large files are frequently uploaded and replaced. MP3 players, digital cameras and USB drives use NAND flash.

NAND Flash is a special form of Flash memory. Flash memory is a memory technology that keeps data even when the power supply is cut off; this is known as a non-volatile memory type. Flash memory can be read pretty fast, but writing to Flash memory is pretty slow compared to many other -volatile- memory technologies such as SRAM or DRAM. Flash also has a limited number of write-cycles; manufacturers typically specify something in the area of 10,000 writes for the lifetime of the part.
NAND Flash is faster than regular Flash, although the general characteristics still hold.
Flash memory is widely used in digital cameras, portable MP3 players, USB (Flash) sticks, and many other devices.

NOR flash memory is a type of non-volatile storage technology that does not require power to retain data.
NAND devices are accessed serially, using the same eight pins to transmit control, addressing and data. NOR flash memory supports one-byte random access, which allows machine instructions to be retrieved and run directly from the chip, in the same way that a traditional computer will retrieve instructions directly from main memory. NOR flash has an SRAM interface that includes enough address pins to map the entire chip, enabling for access to every byte stored within it.

Some devices use both NAND and NOR. A pocket PC, for instance, may use embedded NOR to boot up the operating system and a removable NAND card for all its other memory or storage requirements.