https://blog.wongcw.com/2019/04/11/tlc-qlc%e7%a1%ac%e7%9b%a4%e7%9a%84%e6%ad%bb%e7%b5%90ssd%e7%82%ba%e4%bb%80%e9%ba%bc%e6%9c%83%e6%8e%89%e9%80%9f%ef%bc%9f/