UGC NET CSE | December 2015 | Part 3 | Question: 41

Question

Match the following in Unix file system :

$\begin{array}{clcl}  & \textbf{List-I} & & \textbf{List-II} \\ \text{(a)} & \text{Boot block} & \text{(i)} & \text{Information about file system} \\ \text{(b)} & \text{Super block} & \text{(ii)} & \text{Information about file} \\ \text{(c)} & \text{Inode table} & \text{(iii)} & \text{Storage space} \\ \text{(d)} & \text{Data block} & \text{(iv)} & \text{Code for making OS ready}\\ \end{array}$

$\textbf{Codes :}$

• A. $\text{(a)-(iv), (b)-(i), (c)-(ii), (d)-(iii)}$
• B. $\text{(a)-(i), (b)-(iii), (c)-(ii), (d)-(iv)}$
• C. $\text{(a)-(iii), (b)-(i), (c)-(ii), (d)-(iv)}$
• D. $\text{(a)-(iv), (b)-(ii), (c)-(i), (d)-(iii)}$

Answer 1

(a) Boot block  ------------------------------ (iv) Code for making OS ready

(b) Super block------------------------------ (i) Information about file system

(c) Inode table  ------------------------------ (ii) Information about file

(d) Data block -------------------------------(iii) Storage space

In detail explanation :

Each file system contains:

1. a boot block located in the first few sectors of a file system. The boot block contains the initial bootstrap program used to load the operating system.

Typically, the first sector contains a bootstrap program that reads in a larger bootstrap program from the next few sectors, and so forth.

2. a super block describes the state of the file system: the total size of the partition, the block size, pointers to a list of free blocks, the inode number of the root directory, magic number, etc.

3. a linear array of inodes (short for ``index nodes''). There is a one to one mapping of files to inodes and vice versa. An inode is identified by its ``inode number'', which contains the information needed to find the inode itself on the disk

Thus, while users think of files in terms of file names, Unix thinks of files in terms of inodes.

4. data blocks blocks containing the actual contents of files

Comments

There are 2 terms used here one is file system and another is file .what is the difference between them in reference to the question

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File System : WIthout this, the data in computer is a one large block of data, with no way to retrieve info from it. File system makes it easier for OS and users.