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Information Technology
Gartner Glossary
NAND
NAND flash is nonvolatile memory with multiple floating gates or charge-trapping transistors. Several transistors are connected, and the binary value is controlled by bit line and word line. NAND flash has been migrated from a 2D to a 3D structure to meet the requirement for high bit density. NAND flash can have several bits per cell, which add greater density but with drawbacks in endurance and/or performance:
- SLC: Single-level cell
- MLC: Multilevel cell (2 bits per cell)
- TLC: 3 bits per cell
- QLC: 4 bits per cell
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