Systems Software

Systems Software

1. Utility software

   • File Compression
     • Lossless: The original file can be re-created as no data is lost
     • Lossy: Some of the original data is lost and the original file can not be re-created
     • Reducing the size of the file by performing an algorithm on the original data
   • Disk Defragmentation
     • When a hard disk drive is new – files get added onto the disk in order – very much like starting with a blank piece of paper and adding to it
     • As files are deleted – this leaves gaps
     • When new files are saved – the files fill the gaps and become fragmented
     • Defragmentation software groups fragmented files back together
   • File Repair
   • Disk Copying
   • Disk Formatting
   • Disk Backup / Restore
   • Anti-Virus

2. Operating system

   • Examples of operating systems
     • Windows
     • UNIX
     • MacOS

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