Operating Systems Tasks 17/02/2019

Learning Objectives Discuss the purpose of operating systems. 17/02/2019

All Operating Systems: Control the hardware of the computer system: Memory management to control the way that primary memory is used Resource allocation / processor / printer time Access to peripheral devices via drivers. User interface / HCI: To provide human access and allows communication. Provide environment for application software to be executed and managed: i.e. installation to system, access to memory and allows software translation via compiler / interpreter / assembler. Provide utilities / library routines to carry out “housework” and common tasks e.g. File handling Defragmenting Formatting Virus protection Security backup procedures Privacy logons / passwords 17/02/2019

(Hard-Drive) Utilities Used to control communication between computer and peripherals by converting OS commands into instructions that the peripheral will understand. Supplied with a new peripheral and needs to be installed it can be used. Program Part of OS Designed to carry out “housework” and common tasks. (Hard-Drive) Utilities To protect files from attack by virus File Compression Anti virus software Defragment Hardware Drivers Format Reduces size of files without loss of detail by replacing all common letter combinations by single characters and deleting redundant data so that less storage space required and faster transmission. To keep files sensibly arranged on the hard drive Deletes the contents of a disk, divides the surface of storage media into tracks and sectors and, produces an index before being used. Library / File-handling To manage the files that are stored on a computer system Deleting Files Search Sort Copy / Backup (Organising) New Folders & Moving files 17/02/2019 4

Plenary Describe the features which an operating system would be expected to provide in a single user computer system. 17/02/2019

All Operating Systems Provide: User interface To allow communication/type of interface File handling: To allow use of secondary storage Disk management defragmenting / formatting / storage Virus protection To protect files on secondary storage Security backup procedures 17/02/2019

All Operating Systems Provide: Privacy logons / passwords Access to peripheral devices via drivers / allowing hard copy Memory management To control the way that primary memory is used Manages application software / installation to system / access to memory Resource allocation /processor / printer time 17/02/2019