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Software (Utility Software (Defragmentation (computer stores file on a…
Software
Utility Software
Defragmentation
computer stores file on a disk, computers break up these files into little fragments, meaning a hard disk must seek for all the files to recreate it, defrag moves all free space to a certain block and gathers up all files into certain blocks
Task Scheduling
The OS sets programs to run at certain times such as every week or day, or launch programs on start up.
Data Backup and restore
Data is backed up to other hard disks or servers on the internet, or when everything is backed up on a hard disk (full backup), this will take a long time so may choose to backup data whenever its changed (incremental backup)
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Modes of processing
Real time processing
Data processed instantly, output processed quickly (i.e Air traffic Control)
Batch Processing
Data processed in groups (batches) since layout is similar and inputs data together (i.e payroll system)
Multi-user systems
Many users at different computers sharing a powerful computers processor, known as 'time sharing' system. The OS switches between computers, giving lots of processing power (time slice) before switching again.
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