discovering computers fundamentals, 2011 edition · pdf filesystem software •system...
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Discovering Computers
Fundamentals,
2011 Edition
Living in a Digital World
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Objectives Overview
Define system software and identify
the two types of system software
Describe the functions of an
operating system
Summarize the features of several
stand-alone operating systems
Identify various server operating
systems
Briefly describe several embedded operating systems
Explain the purpose of several utility
programs
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2See Page 269
for Detailed Objectives
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System Software
• System software consists of the programs that control or maintain the operations of the computer and its devices
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Operating systems
Utility Programs
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Operating Systems
• An operating system (OS) is a set of programs containing instructions that work together to coordinate all the activities among computer hardware resources
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Start and shut down a
computer
Provide a user interface
Manage programs
Manage memory
Coordinate tasks
Configure devices
Establish an Internet
connection
Monitor performance
Provide utilities
Automatically update
Control a network
Administer security
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Operating Systems
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Figure 7-1
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Operating System Functions
• The process of starting or restarting a computer is called booting
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Figure 7-2
Cold boot
• Turning on a computer that has been powered off completely
Warm boot
• Using the operating system to restart a computer
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Operating System Functions
• An operating system includes various shut down options
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Sleep mode saves any open documents and programs to RAM, turns off all unneeded functions, and then places
the computer in a low-power state
Hibernate saves any open documents and programs to a hard disk before removing power from the computer
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Operating System Functions
• A user interfacecontrols how you enter data and instructions and how information is displayed on the screen
• With a graphical user interface (GUI), you interact with menus and visual images
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Figure 7-3a
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Operating System Functions
• With a command-line interface, a user uses the keyboard to enter data and instructions
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Figure 7-3b
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Operating System Functions
• How an operating system handles programs directly affects your productivity
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Single user and multiuser
Single tasking and
multitasking
Foreground and background
Multiprocessing
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Operating System Functions
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Figure 7-4
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Operating System Functions
• Memory management optimizes the use of RAM
• Virtual memory is a portion of a storage medium functioning as additional RAM
• Windows ReadyBoost can allocate available memory in flash memory devices as additional memory cache
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Operating System Functions
• The operating system determines the order in which tasks are processed
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Figure 7-5
Click to view Web Link,click Chapter 7, Click Web Link from left navigation, then click Spooling below Chapter 7
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Operating System Functions
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Operating System Functions
• Operating systems typically provide a means to establish Internet connections
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Figure 7-6
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Operating System Functions
• A performance monitor is a program that assesses and reports information about various computer resources and devices
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Operating System Functions
• Operating systems often provide users with the capability of:
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Managing filesSearching for
filesViewing images
Securing a computer
Uninstalling programs
Cleaning up disks
Defragmenting disks
Diagnosing problems
Backing up files and disks
Setting up screen savers
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Operating System Functions
• Automatic update automatically provides updates to the program
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Operating System Functions
• Some operating systems are designed to work with a server on a network
• A server operating system organizes and coordinates how multiple users access and share resources on a network
• A network administrator uses the server operating system to:
– Add and remove users, computers, and other devices
– Install software and administer network security
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Operating System Functions
• Each user has a user account
– A user name, or user ID, identifies a specific user
– A password is a private combination of characters associated with the user name
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Figure 7-7
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Types of Operating Systems
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Figure 7-8
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Stand-Alone Operating Systems
• A stand-alone operating system is a complete operating system that works on a desktop computer, notebook computer, or mobile computing device
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Windows 7
Mac OS X
UNIX Linux
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Stand-Alone Operating Systems
• Windows 7 is Microsoft’s fastest, most efficient operating system to date and is available in multiple editions:
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Windows 7 Starter
Windows 7 Home
Premium
Windows 7 Ultimate
Windows 7 ProfessionalClick to view Web Link,
click Chapter 7, Click Web Link from left navigation, then click Windows 7below Chapter 7
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Stand-Alone Operating Systems
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Figure 7-9
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Stand-Alone Operating Systems
• The Macintosh operating system has set the standard for operating system ease of use
• Latest version is Mac OS X
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Figure 7-10
Click to view Web Link,click Chapter 7, Click Web Link from left navigation, then click Mac OS Xbelow Chapter 7
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Stand-Alone Operating Systems
UNIX is a multitasking operating system
Linux is an open-source, popular, multitasking UNIX-type operating system
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Figures 7-11 – 7-12
Click to view Web Link,click Chapter 7, Click Web Link from left navigation, then click Linuxbelow Chapter 7
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Server Operating Systems
Windows Server 2008
UNIX Linux
Solaris NetWare
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Embedded Operating Systems
• An embedded operating system resides on a ROM chip on a mobile device or consumer electronic device
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Windows Embedded CE
Windows Mobile
Palm OS iPhone OS
BlackBerryGoogle Android
Embedded Linux
Symbian OS
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Utility Programs
• A utility program is a type of system software that allows a user to perform maintenance-type tasks
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Figure 7-14
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Utility Programs
• A file manager is a utility that performs functions related to file management
– Displaying a list of files
– Organizing files in folders
– Copying, renaming, deleting, moving, and sorting files and folders
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Figure 7-15
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Utility Programs
• A search utility is a program that attempts to locate a file on your computer based on criteria you specify
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Figure 7-16
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Utility Programs
• An uninstaller removes a program, as well as any associated entries in the system files
• An image viewer allows users to display, copy, and print the contents of a graphics file
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Figure 7-17
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Utility Programs
• A disk cleanup utility searches for and removes unnecessary files
– Downloaded programfiles
– Temporary Internetfiles
– Deleted files
– Unused programfiles
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Utility Programs
• A disk defragmenter reorganizes the files and unused space on a computer’s hard disk so that the operating system accesses data more quickly and programs run faster
– Defragmenting
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Figure 7-18
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Utility Programs
• A backup utility allows users to copy files to another storage medium
• A restore utilityreverses the process and returns backed up files to their original form
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Utility Programs
• A screen saver causes a display device’s screen to show a moving image or blank screen if no activity occurs for a specified time
• A personal firewalldetects and protects a personal computer from unauthorized intrusions
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Figure 7-19
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Utility Programs
A virus describes a potentially damaging computer program that affects a computer negatively
A worm copies itself
repeatedly in memory or
over a network
A Trojan horsehides within or
looks like a legitimate program
An antivirus program
protects a computer
against viruses
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Utility Programs
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Figures 7-20 – 7-21
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Utility Programs
Spyware is a program placed on a computer without the user’s
knowledge that secretly collects information about the user
• A spyware remover detects and deletes spyware and other similar programs
Adware displays an online advertisement in a banner or
pop-up window
• An adware remover is a program that detects and deletes adware
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Utility Programs
• Filters are programs that remove or block certain items from being displayed
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Anti-spam programs
Web filters
Phishing filters
Pop-up blockers
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Utility Programs
• A file compression utility shrinks the size of a file(s)
– Compressing files frees up room on the storage media
• Compressed files sometimes are called zipped files
– Can be uncompressed
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Utility Programs
• A media player allows you to view images and animation, listen to audio, and watch video files on your computer
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Figure 7-22
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Utility Programs
• Disc burning softwarewrites text, graphics, audio, and video files on a recordable or rewritable optical disc
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Figure 7-23
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Utility Programs
• A personal computer maintenance utility identifies and fixes operating system problems, detects and repairs disk problems, and includes the capability of improving a computer’s performance
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Figure 7-24
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Summary
Definition of an operating system
Functions common to most operating systems
Variety of stand-alone operating systems,
server operating systems, and embedded
operating systems
Several utility programs
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Discovering Computers
Fundamentals,
2011 Edition
Living in a Digital World
Chapter 7 Complete