SLC, MLC, TLC, QLC
![](https://pic.pimg.tw/lionrex/1515149029-332966678.png)
![](https://pic.pimg.tw/lionrex/1515149030-1905342284.png)
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
![](https://pic.pimg.tw/lionrex/1515149031-2438905611.png)
![](https://pic.pimg.tw/lionrex/1515149031-506494730.png)
![](https://pic.pimg.tw/lionrex/1515149032-2027719222.png)
2D and 3D NAND Technology Roadmap
![](https://pic.pimg.tw/lionrex/1515149034-1490676242.png)
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)
![](https://pic.pimg.tw/lionrex/1515149035-1306167021.png)
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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