《Operating System Concepts》學習第 46 天，p528-p544 總結，總計 17 頁。

一、技術總結

1.file

(1)定義

The smallest logical storage unit; a collection of related information defined by its creator.

(2)file attributes

一般來說，包含 name, identifier, type, location, size, protection, timestamps and user identification。

(3)access methods

1)sequential access

2)direct access

2.directory

(1)structure of a dictory

single-level directory，two-level directory，tree-structure directory，acyclic-graph directory。

二、英語總結(生詞：1)

1.allotment

(1)allot: ad-("to") + lot("portion(比例), share(份額)")

vt. divide or distribute as by lots(分配)。

(2)allotment

c/u. the acting of allot.

(3)示例

From a user’s perspective, a file is the smallest allotment of logical secondary storage; that is, data cannot be written to secondary storage unless they are within a file(《Operating System Concepts》第 530 頁)。

關于英語的注解同步更新匯總到 https://github.com/codists/English-In-CS-Books 倉庫。

三、其它

今天沒有什么想說的。

四、參考資料

1. 編程

(1) Abraham Silberschatz，Peter Baer Galvin，Greg Gagne《Operating System Concepts》：https://book.douban.com/subject/30272539/

2. 英語

(1) Etymology Dictionary：https://www.etymonline.com

(2) Cambridge Dictionary：https://dictionary.cambridge.org

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