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Software (System Software (Allocating Memory (The OS organises the use of…
Software
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Modes of Processing
Real-time Processing
Data is processed immediately, output is processed quickly.
E.g. air traffic control, concert booking system
Batch Processing
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E.g. payroll system, billing system
Multi-user systems
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The OS switches between computers, giving a lot of processing power(a time slice) for a short time before going to the next in line.
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Anti-Virus
Virus: A virus is a malicious software program deigned to copy itself onto a computer in order to obtain, alter or delete stored data.
New viruses are created every day to take advantage of security flaws in software. Software updates often patch these security risks.
Anti-Virus software is responsible for detecting, blocking and quarantining computer viruses.
Utility Software
Disc-Defragmentation
A computer stores its files on a disk and even though large disks may not have a single continuous block of empty space to hold a single file computers 'break up' a file into little parts or fragments.
This means that a hard disk has to search for all the files until it can recreate the files on screen.
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Data Backup and Restore
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This will take a long time and so we may choose to only backup that data when it has changed. This is called an incremental backup.
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