Alan Freedman -- The Computer Language Company - Computer Desktop Encyclopedia
Computer Desktop Encyclopedia
Longest-Running Tech Reference on the Planet

A CDE Definition

You'll love The Computer Desktop Encyclopedia (CDE) for Tech Term of the Day (TTOD)

LOOK UP ANOTHER TERM


NAND flash

The type of flash memory used in a solid state drive (SSD), USB drive and memory card. For the difference between NAND and NOR flash, see flash memory.

2D NAND - Limitations
Traditional flash memory has a single layer of cells, known as "2D planar NAND." As manufacturers shrank the cells and cell walls to increase storage density, fewer electrons resided in each cell, and leakage would occur. In addition, storing two and three bits in a single cell made ever smaller cells increasingly problematic.

3D NAND - The Solution
Instead of making cells smaller, the solution was to stack layers of cells on top of one another for greater storage on a single chip. In 2013, Samsung began making 48-layer 3D Vertical NAND (V-NAND) chips, eventually offering 64 layers. Other manufacturers followed with their own 3D NAND products. In 2017, SK Hynix announced a 72-layer 256GB NAND flash chip using trilevel cells (see MLC).

Why NAND and NOR Monikers?
NAND and NOR are logic gates, and their names were chosen for flash memory due to the way the two different flash circuits are wired. See logic gate and flash memory.



Personal Use Only

Before/After Your Search Term
BeforeAfter
Named Pipesnanny software
namesnannycam
nameservernano
namespacenano-ionic
naming fiascosnano-satellite
naming serviceNano SIM
NANNano-X Window System
Nanchuknanochondria
Nanconananocomposite
NANDnanocrystal

Terms By Topic
Click any of the following categories for a list of fundamental terms.
Computer Words You Gotta KnowSystem design
Job categoriesUnix/Linux
Interesting stuffPersonal computers
InternetIndustrial Automation/Process Control
Communications & networkingAssociations/Standards organizations
HistoryDesktop publishing
Audio/VideoGraphics
MainframesSecurity
ProgrammingHealthcare IT
System design