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Ch10 檔案管理
第 20 題／共 28 題
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OS 20/28
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20. File System、FCB、File Extension、mmap
#OS-10-020
易
File System
FCB
File Extension
mmap
📝
☆
Which of the following statements on file system are true?
A
(a) A file control block (FCB) (an inode in UNIX file systems) contains information about the file, including ownership, permissions, and location of the file contents.
B
(b) File-name extensions (e.g., .txt, .jpeg) on UNIX systems are necessary and critical, as they guide the operating system to run the right application (e.g., text editor or gallery) for opening files.
C
(c) Multiple processes may be allowed to map the same file concurrently and to allow sharing of data. Writes by any of the processes modify the data in virtual memory and can be seen by all others that map the same section of the file.
D
(d) A disk can be sliced into multiple partitions and each partition is not functionable without containing a file system. That is, each partition must contain one file system (e.g., NTFS, Ext4).
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