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SLC, MLC, TLC, QLC
SLC (Single-level cell) 1 bit of data per cell Fastest writing speed Longest service life (P/E Cycle is approximately 50,000 to 100,000) | MLC (Multi-level cell) 2 bits of data per cell Writing speed < SLC Average service life (P/E Cycle is approximately 3,000 to 10,000) | TLC (Triple-level cell) 3 bits of data per cell Writing speed < MLC Has less than half of MLC’s service life (P/E Cycle is approximately 500 to 1,000) | QLC (Quad-level cell) 4 bits of data per cell Slowest writing speed Shortest service life, currently under development |
2D NAND vs 3D NAND
2D and 3D NAND Technology Roadmap
2007- BiCS（Bit Cost Scalable）技術（包含多堆疊柵極層結構）被提出
2009年，金屬柵極三維NAND閃存技術（TCAT）被提出來
下面是四大NAND廠商的3D-TLC產品。
Micron B0KB 3D TLC 384Gb。
Toshiba 3D BiCS2 TLC 256Gb
SK Hynix 3D-v3 TLC 256Gb
Samsung 3D-v2 TLC 256Gb
3D-TLC存儲密度大，但是相比MLC，出錯率更高，必須要有更高效、糾錯能力更強的技術支持，這就是LDPC（Low Density Parity Check Code，低密度奇偶校驗碼）
ref:
https://www.techporn.ph/tlc-is-becoming-the-mainstream-for-ssd-in-the-consumer-market/
https://www.pcper.com/news/Storage/Transcend-run-MLC-Flash-SLC-Mode-SuperMLC-Speed-Boost
https://semiengineering.com/nand-market-hits-speed-bump/
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