System software - utilities
- Created by: Tomiwaq
- Created on: 29-03-19 10:34
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- Systems software - utilities
- Defragmentation
- Files are stored on a hard disk in available spaces
- Files can also be moved, deleted and change size creating small gaps
- The OS splits files into smaller blocks to fill up the gaps
- Over time the disk gets more and more fragmented
- This makes reading / writing slower
- Defragmentation software recognises data on the hard drive to put fragmented files back together
- SSDs use flash storage and so don't need to be fragmented
- Backup utilities
- A backup is a copy of a computer system's files and settings stored externally
- It means data can be recovered
- Backup utilities is software with facilites
- Scheduling regular backups
- Creating rescue disks
- Disk images
- Full or incremental backups
- Full backup is where a copy is taken of every file on the system
- Incremental backups are where only the files created or edited since the last backup are copied
- A backup is a copy of a computer system's files and settings stored externally
- Compression software
- Reduces the size of files so they take up less disk space
- It's used a lot on downloads from the internet to make it faster
- Must be extracted before they can be used
- Encryption software
- Scrambles data to stop third-parties from accessing it
- Encrypted data must be decrypted using a special 'key'
- Defragmentation
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