《Operating System Concepts》学习第 35 天，p449-p459 总结，总计 11 页。
一、技术总结
1.NVM & SSD
Flash-memory-based NVM is frequently used in a disk-drive-like container, in which case it is called a solid-state disk (SSD) (Figure 11.3)。
2.HDD Scheduling
(1)FCFS Scheduling
(2)SCAN Scheduling
(3)C-SCAN Scheduling
二、英语总结(生词：2)
1.platter
(1)platter: plate("metal plate")
c. large, shallow dish for holding food(大浅盘)。
(2)示例
Conceptually, HDDs are relatively simple (Figure 11.1). Each disk platter has a flat circular shape, like a CD(《Operating System Concepts》第 450 页)。
2.entail
(1)entail: en-("to make") + taile("legal limitation")
vt. involve sth as a necessary part(使必要，牵涉)。
(2)示例
For HDDs, meeting this responsibility entails minimizing access time and maximizing data transfer bandwidth(《Operating System Concepts》第 457 页)。
关于英语的注解同步更新汇总到 https://github.com/codists/English-In-CS-Books 仓库。
三、其它
今天没有什么想说的。
四、参考资料
1. 编程
(1) Abraham Silberschatz，Peter Baer Galvin，Greg Gagne《Operating System Concepts》：https://book.douban.com/subject/30272539/
2. 英语
(1) Etymology Dictionary：https://www.etymonline.com
(2) Cambridge Dictionary：https://dictionary.cambridge.org
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