System Software

System Software

1. Operating System

   • Multi-tasking Peripheral Management and Drivers
   • User Interface Memory Management
   • Multi-tasking Peripheral Management and Drivers User
   • File Management
   • User Management

2. Utility Software

   • Disk Defragmentation
     • files get added onto the disk in order 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 Compression
     • Lossy
       • Reducing the size of the algorithm on the original data
     • Lossless
       • The original file can be re-created as no data is lost
   • Disk Copying
   • File Repair
   • Disk Formatting
   • Disk Backup / Restore
     • Ensures that if computers are stolen or damaged in for e.g. a fire or a natural disaster that data can be restored and a company do not lose much money
     • Completed to ensure there is a way of restoring files/data/programs in case of computer failure Copies of data and/or software are taken regularly and usually stored in a different location
     • Full
       • A copy of all data and software on the hard disk drive / server is copied to a backup medium (e.g. an external hard disk drive / DVD-R) and the medium is kept at a different location Take a long time to complete (usually overnight) Recovery takes a long time as it restores all data and programs
     • Incremental
       • A full backup is made initially Each night only the files which have been changed since the last incremental back-up are copied Much faster to complete that full back-ups Takes much longer at restoring than a Full Back up as the full back up would need restoring first and then every incremental back-up since the last full back up
   • Anti-Virus
   • Encryption
     • Encryption means to scramble data in a way that it is unreadable to anybody who doesn’t have a key to be able to unscramble this. Data is encrypted using a key and then decrypted using a key Data is encrypted so that it is unreadable if anyone is to intercept it