Unit 1.7 System Sofware

Unit 1.7 System Sofware

1. GUI

   • Graphic User Interface

2. Diagram of System Software

   • System Software
     • OS
     • Utility Programs
       • Anti-Virus
       • Disk Defragmentation Tool
       • Disk Copier/Formatter
       • Disk Compression
     • Device Drivers
       • Graphics Card Driver
       • Network Interface Card Driver

3. Keywords

   • System Software
     • Software that controls a computer's hardware
   • OS
     • Provides an interface between user and the hardware
   • Virtual Machine
     • Hides complexities of hardware from the user
   • Memory Management
     • The OS allocates memory between the different programs that are open at the time
   • Device Drivers
     • OS specific and are updated regularly by companies
     • A piece of software that is used to control a piece of hardware
   • Peripheral management
     • Hardware not directly connected to the CPU
     • E.G. settings in Windows
   • File management
     • Needs the specific track, sector and surface address but the user doesn't know where they are kept
   • Utility Software
     • Maintains the computer or system
   • Lossy
     • Form of data compression in which some original data is lost menaing that the original file can't be recreated
   • Lossless
     • Form of data compression in which no data is lost and original file can be recreated
   • Public key
     • Used to encrypt anything anyone wants to send to a person
   • Private key
     • Only the person who is the intended recipient can decrypt
   • Compression
     • Reducing the size of the file by performing an algorithm on the original data

4. Defragmentation

   • Speeds the computer up
   • It brings together all the files that have been saved and then edited later on to one location

5. Backing up Data

   • We backup data that has value. You nneed to have a backup strategy
     • The backup strategy will include...
       • Who does it?
       • What data is being backed up?
       • How often?
       • Where is it saved to and where is that kept?
       • How is it restored?
       • How long will it take?
         • Hot start
           • Another office to replace the primary office in event of a fire or natural disaster. This allows them to just go to the new building and upload the software
         • Cold start
           • Pay a share into a generic, shared office. Recovery is slower than a hot start as you have to upload programs as well as the software and data. It also isn't necessarily set up in the way the company would like it
   • Full backup
     • Everything is backed up
     • Recovery takes a long time
   • Incremental backup
     • Full backup initially made
     • Each night, only changes are backed up
     • Quicker to save, slower to restore