Utility Software

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Utility Software Full Lesson Video.mp4

Task - Fill in the Blanks

Utility Software Activity

Exam Questions - Web

Antivirus

Scans the computer periodically
To check if any software has been installed which contains code that may harm the computer
Removes/quarantines these programs / notifies the user
Prevents these programs from being installed
Protects the computer by preventing important files (eg the boot sector or operating system) from being changed

Disk defragmenter

Moves (parts of) of files around so that all parts of a file are stored together (allowing files to be accessed more quickly)
Free space is collected together (allowing large files to be saved easily)

Use an algorithm
...to remove repeated/unnecessary data
Could use lossy/lossless unnecessary data
Lossless will not remove data permanently // lossless means original file will be restored
lossy is permanent deletion // lossy means original file will not be restored
Reduce number of pixels // reduce resolution noticeable to the human
Record the changes in the colour for each pixel
... instead of the colour
Run length encoding
... record the colour and number of consecutive pixels of that colour
... instead of the colour of every pixel
Decrease colour depth//decrease number of colours