Consider a disk that has 15 data blocks starting from block 20 through 34. We are given the FAT (file allocation table) entries below. The special value -1 indicates the last block of a file while the special value -2 indicates a free block. (a) Look at the FAT in Figure 1(a). How many files are there? What data blocks belong to these files. (b) The FAT in Figure 1(b) contains one or more errors. Find all errors and suggest how to fix the table (create a valid FAT with minimum number of changes). (c) Fill in the blank FAT in Figure 1(c) so that there will be four files in total having 2, 3, 3, and 4 data blocks. Randomly choose blocks that belong to a file in such a way that no two adjacent blocks will belong to the same file. 20-1 20 28 20 21 20 21-2 21 22 31 22 30 22 23 30 23-2 23 24-1 24 27 24 25-2 25 34 25 26 29 26 25 27 23 27 29 28-2 28 -2 22 26 27 28 29 32 29 22 29 30 24 30 24 30 31 34 31 26 31 32 21 32 25 32 33 -2 33 -2 33 34 -1 34 -1 34 (a) Figure 1: FATS (b) (c)
Consider a disk that has 15 data blocks starting from block 20 through 34. We are given the FAT (file allocation table) entries below. The special value -1 indicates the last block of a file while the special value -2 indicates a free block. (a) Look at the FAT in Figure 1(a). How many files are there? What data blocks belong to these files. (b) The FAT in Figure 1(b) contains one or more errors. Find all errors and suggest how to fix the table (create a valid FAT with minimum number of changes). (c) Fill in the blank FAT in Figure 1(c) so that there will be four files in total having 2, 3, 3, and 4 data blocks. Randomly choose blocks that belong to a file in such a way that no two adjacent blocks will belong to the same file. 20-1 20 28 20 21 20 21-2 21 22 31 22 30 22 23 30 23-2 23 24-1 24 27 24 25-2 25 34 25 26 29 26 25 27 23 27 29 28-2 28 -2 22 26 27 28 29 32 29 22 29 30 24 30 24 30 31 34 31 26 31 32 21 32 25 32 33 -2 33 -2 33 34 -1 34 -1 34 (a) Figure 1: FATS (b) (c)
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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Transcribed Image Text:Consider a disk that has 15 data blocks starting from block 20 through 34. We are given
the FAT (file allocation table) entries below. The special value -1 indicates the last block
of a file while the special value -2 indicates a free block.
(a) Look at the FAT in Figure 1(a). How many files are there? What data blocks
belong to these files.
(b) The FAT in Figure 1(b) contains one or more errors. Find all errors and suggest
how to fix the table (create a valid FAT with minimum number of changes).
(c) Fill in the blank FAT in Figure 1(c) so that there will be four files in total having
2, 3, 3, and 4 data blocks. Randomly choose blocks that belong to a file in such a
way that no two adjacent blocks will belong to the same file.
20-1
20
28
20
21
20
21-2
21
22 31
22 30
22
23 30
23-2
23
24-1
24
27
24
25-2
25
34
25
26
29
26
25
27
23
27 29
28-2
28
-2
22
26
27
28
29 32
29
22
29
30
24
30
24
30
31
34
31
26
31
32 21
32
25
32
33 -2
33 -2
33
34
-1
34 -1
34
(a)
Figure 1: FATS
(b)
(c)
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