79. The type of allocation in which blocks of file are allocated to consecutive blocks of disks is classified as a. indexed allocation b. header allocation c. contiguous allocation d. linked allocation
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79. | The type of allocation in which blocks of file are allocated to consecutive blocks of disks is classified as |
a. | indexed allocation |
b. | header allocation |
c. | contiguous allocation |
d. | linked allocation |
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- With linked allocation, each file is a linked list of disk blocks; the disk blocks may be scattered anywhereon the disk. The directory contains a pointer to the first and last blocks of the file. Each block contains a pointerto the next block. Refer to the illustration below. Need help to fill in the codes in void main() --- #include<stdio.h>#include<stdlib.h>#define TOTAL_DISK_BLOCKS 32#define TOTAL_DISK_INODES 8int blockStatus[TOTAL_DISK_BLOCKS]; // free = 0int blockList[TOTAL_DISK_BLOCKS - TOTAL_DISK_INODES]; // list of blocks of a filestruct file_table {char fileName[20];int fileSize;struct block *sb;};struct file_table fileTable[TOTAL_DISK_BLOCKS - TOTAL_DISK_INODES];struct block {int blockNumber;struct block *next;};int AllocateBlocks(int Size) {---}void main(){int i = 0, j = 0, numFiles = 0, nextBlock= 0, ret = 1;char s[20]; struct block *temp;---for(i = 0; i < numFiles; i++) {---ret = AllocateBlocks(fileTable[i].fileSize);---}---//Seed the pseudo-random number…5. Assume a file system is using combined indexing scheme to keep track of the blocks allocated to a file, as in Linux/Unix file system. In the inode of a file, there are 12 direct pointers, one single-indirect pointer, one double-indirect pointer, and one triple-indirect pointer. Assume the size of a disk block address (i.e., disk pointer size) is 8 bytes. Assume block size is 4 KB. a) What is the maximum file size? b) How many index blocks are required for files of size 30 KB, 256KB, 15 MB, 512 MB, 32 GB? c) Assume nothing is cached (no disk caching applied in the system) and we know the disk location of the inode of a file of size 1 GB. How many disk accesses are required to access a byte at offset 2^14 (16K) in the file? How many disk accesses are required to access a byte at offset 2^26 in the file?75. In the allocation of file blocks on disk, the clusters are also called a. indexes b. file segments c. extents d. both b and c
- 1:34 b a 2. Different operating systems use different file allocation techniques to store files in the secondary storage device such as HDD. One of the techniques is "Linked allocation". In this technique, each file is divided into several data blocks of same size. Each data block has a link to its next block like a singly linked list. So, the data blocks are scattered on the disk. The directory contains a pointer to the starting and the ending data block of a file. The diagram below depicts a sample linked allocation system of a file Abc.txt: Directory entry File Start End Abc.txt 100 900 Data 900 Data Data block 1 block 2 Data block 3 block N Write a Java program to implement the linked allocation of a given text file Assgn1_2.txt (uploaded with the assignment) who's each block will contain maximum 50 characters. Read the content of the given file and store it in data blocks (maximum 50 characters per block). Now show a menu that will ask the user to i) add new content at the end of…In a contiguous allocation, if the file has n blocks long and starts at location b, the starting and last blocks being occupied by the file is ___ respectively. a. b and b + n - 1 b. n and b + n + 2 c. b and b + n d. n and n + b -1393. File organization system that uses two files for every data file is said to be a. Cluster sequential files b. Indexed sequential files c. Cluster random files d. Indexed random files
- The three most important file structure approaches should be described.92. In external hashing for files of disk, the pointers which contain record position and block address within the block are classified as a. position pointers b. address pointers c. block pointers d. record pointers25. To have a file hold a list, it is necessary to a. identify the records in the list b. identify the name, width and type of the fields of each record. c. decide which fields will be used as sort or index keys d. All of the above
- UNIX ASSIGNMENT - IXQuestion 9 : In an organisation one wants to know how many programmers are there. The employee data is stored in a file called ‘personnel’ with one record per employee. Every record has field for designation. How can grep be used for this purpose?357. An allocation that uses a proportional allocation scheme using priorities rather than size. a. Priority allocation b. File allocation c. Preference allocation d. Simple allocation82. The best file organization in which one has to process all data records in a file called a. Indexed b. Sequential c. Direct access d. Random access