System Software - Utilities

Question 1

Defragmentation

Answer 1

Put broken up files back together
Reorganises data on hard drive to put fragmented files back together

Question 2

How does Fragmentation occur?

Answer 2

When files are moved, deleted and change size, there are lots of gaps which are filled when new data arrrives
Read/write head has to move back and forth across the disc.
Random arrangement of files results

Question 3

SSDs

Answer 3

defragmentation would make it slower as it has a limited number of read/write cycles

Question 4

What does compression do?

Answer 4

Reduces file size by permanently or temporarily removing data from them
Takes up less disc space
Need to be extracted before they can be used

Question 5

File formats for compression

Answer 5

.zip
.rar

Question 6

Encryption Software

Answer 6

scrambles /encrypts data for security
To decrypt data a key is needed -> key cannot be guessed and cracked with brute force attacks