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NAND Flash
Toshiba announced NAND flash at ISSCC in 1989. It has faster erase and write times, and requires a smaller chip area per cell, thus allowing greater storage densities and lower costs per bit than NOR flash; it also has up to ten times the endurance of NOR flash. NAND flash is similar to other secondary storage devices such as hard disks and optical media, and is thus very suitable for use in mass-storage devices such as memory cards. The first NAND-based removable media format was SmartMedia, and many others have followed, including MultiMediaCard, Secure Digital, Memory Stick and xD-Picture Card.
NAND flash memories cannot provide execute in place due to their different construction principles. These memories are accessed much like block devices such as hard disks or memory cards. NAND flash memory forms the core of the removable USB interface storage devices known as USB flash drives, as well as most memory card formats available today.
Nanometer
(nm)
One billionth of a meter.
Nanosecond(ns)
One billionth of a second; used
to measure the speed of the parts
Nibble
Usually 4 bits (half a byte).
Nonvolatile
Memory
A memory that retains information
if power is removed and then reapplied.
SRAM and flash are examples of
nonvolatile memory
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