System Software

System Software

1. Operating System

2. Utility Software

   • File Compression
     • Reducing the size of the file by performing an algorithm on the original data
       • 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
   • Disk Defragmentation
     • When a hard drive disk is new, files get added to the disk in order. When files are deleted, this leaves gaps
       • When new files are saved they become fragmented to fill the gaps.
         • Defragmentation software groups fragmented files back together
   • File Repair
   • Disk Copying
   • Disk Formatting
   • Disk Backup / Restore
     • Ensures that there is a way to restore files/data/programs in case of computer failure
   • Anti-Virus
   • Encryption
     • Encryption scrambles data
       • Encrypted with a key and then decrypted with a key
         • Unreadable to anyone that intercepts it