Discovering Computers Living in a Digital World
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1 Discovering Computers 2011 Living in a Digital World
2 Objectives Overview Define system software and identify the two types of system software Describe the functions of an operating system Summarize the startup process on a personal computer Summarize the features of several stand-alone operating systems Briefly describe various server operating systems Summarize the features of several embedded operating systems Explain the purpose of several utility programs See Page 397 for Detailed Objectives 2
3 System Software System software consists of the programs that control or maintain the operations of the computer and its devices Operating systems Utility Programs Page 398 3
4 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 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 Pages
5 Operating Systems Pages Figure 8-1 5
6 Operating System Functions The process of starting or restarting a computer is called booting Cold boot Turning on a computer that has been powered off completely Warm boot Using the operating system to restart a computer Page 400 Figure 8-2 6
7 Operating System Functions Page 401 Figure 8-3 Click to view Web Link, click, Click Web Link from left navigation, then click Windows Registry below 7
8 Operating System Functions A boot drive is the drive from which your computer starts You can boot from a boot disk A recovery disk contains a few system files that will start the computer Page 402 8
9 Operating System Functions An operating system includes various shut down options Sleep mode saves any open documents and programs to RAM, turns off all unneeded functions, and then places the computer in a lowpower state Hibernate saves any open documents and programs to a hard disk before removing power from the computer Page 402 Click to view Web Link, click, Click Web Link from left navigation, then click Sleep Mode below 9
10 Operating System Functions A user interface controls 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 Pages Figure
11 Operating System Functions With a command-line interface, a user uses the keyboard to enter data and instructions Page 403 Figure
12 Operating System Functions How an operating system handles programs directly affects your productivity Single user and multiuser Single tasking and multitasking Foreground and background Preemptive multitasking Multiprocessing Pages
13 Operating System Functions Page 404 Figure
14 Operating System Functions Memory management optimizes the use of RAM Virtual memory is a portion of a storage medium functioning as additional RAM Page 406 Figure
15 Operating System Functions The operating system determines the order in which tasks are processed Page 407 Figure 8-9 Click to view Web Link, click, Click Web Link from left navigation, then click Spooling below 15
16 Operating System Functions Page 408 Click to view Web Link, click, Click Web Link from left navigation, then click Plug and Play below 16
17 Operating System Functions Operating systems typically provide a means to establish Internet connections Page 408 Figure
18 Operating System Functions A performance monitor is a program that assesses and reports information about various computer resources and devices Pages Figure
19 Operating System Functions Operating systems often provide users with the capability of: Managing files Searching for files Viewing images Securing a computer Uninstalling programs Cleaning up disks Defragmenting disks Diagnosing problems Backing up files and disks Setting up screen savers Page
20 Operating System Functions Automatic update automatically provides updates to the program Page 409 Figure
21 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 Page
22 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 Page 410 Figure
23 Types of Operating Systems Page 412 Figure
24 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 Windows Mac OS X 7 UNIX Linux Page
25 Stand-Alone Operating Systems Windows 7 is Microsoft s fastest, most efficient operating system to date and is available in multiple editions: Windows 7 Starter Windows 7 Home Premium Pages Click to view Web Link, click, Click Web Link from left navigation, then click Windows 7 below Windows 7 Ultimate Windows 7 Professional 25
26 Stand-Alone Operating Systems Windows 7 provides programs such as: Windows Firewall Windows DVD Maker Windows Media Player Desktop Gadget Gallery Page
27 Stand-Alone Operating Systems Page 414 Figures
28 Stand-Alone Operating Systems Page 415 Figure
29 Stand-Alone Operating Systems The Macintosh operating system has set the standard for operating system ease of use Latest version is Mac OS X Page 415 Figure 8-19 Click to view Web Link, click, Click Web Link from left navigation, then click Mac OS X below 29
30 Stand-Alone Operating Systems UNIX is a multitasking operating system developed in the early 1970s Linux is an open-source, popular, multitasking UNIXtype operating system Pages Figures Click to view Web Link, click, Click Web Link from left navigation, then click Linux below 30
31 Server Operating Systems Windows Server 2008 UNIX Linux Solaris NetWare Pages
32 Server Operating Systems Windows Server 2008 is an upgrade to Windows Server 2003 Part of the Windows Server 2008 family Multiple editions Most editions include Hyper-V, a virtualization technology Virtualization is the practice of sharing or pooling computing resources Click to view Web Link, click, Click Web Link from left navigation, then click Virtualization below Pages
33 Embedded Operating Systems An embedded operating system resides on a ROM chip on a mobile device or consumer electronic device Windows Embedded CE Windows Mobile Palm OS iphone OS BlackBerry Google Android Embedded Linux Symbian OS Pages
34 Embedded Operating Systems Click to view Web Link, click, Click Web Link from left navigation, then click iphone OS below Pages Figures Click to view Web Link, click, Click Web Link from left navigation, then click Blackberry below 34
35 Utility Programs A utility program is a type of system software that allows a user to perform maintenance-type tasks Page 421 Figure
36 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 Creating shortcuts Page 422 Figure
37 Utility Programs A search utility is a program that attempts to locate a file on your computer based on criteria you specify Page 422 Figure
38 Utility Programs An image viewer allows users to display, copy, and print the contents of a graphics file An uninstaller removes a program, as well as any associated entries in the system files Page 423 Figure
39 Utility Programs A disk cleanup utility searches for and removes unnecessary files Downloaded program files Temporary Internet files Deleted files Unused program files Page 423 Figure
40 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 Pages Figure
41 Utility Programs A backup utility allows users to copy files to another storage medium A restore utility reverses the process and returns backed up files to their original form Page 424 Figure
42 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 firewall detects and protects a personal computer from unauthorized intrusions Page 425 Figures
43 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 horse hides within or looks like a legitimate program An antivirus program protects a computer against viruses Pages
44 Utility Programs Pages Figures
45 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 Page
46 Utility Programs Filters are programs that remove or block certain items from being displayed Web filters Anti-spam programs Phishing filters Pop-up blockers Pages
47 Utility Programs A file compression utility shrinks the size of a file(s) Compressing files frees up room on the storage media Two types of compression Lossy Lossless Compressed files sometimes are called zipped files Can be uncompressed Click to view Web Link, click, Click Web Link from left navigation, then click WinZip below Page
48 Utility Programs A media player allows you to view images and animation, listen to audio, and watch video files on your computer Page 427 Figure
49 Utility Programs Disc burning software writes text, graphics, audio, and video files on a recordable or rewritable optical disc Page 428 Figure 8-39 Click to view Web Link, click, Click Web Link from left navigation, then click Burning Discs below 49
50 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 Page 428 Figure
51 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 Page
52 Discovering Computers 2011 Living in a Digital World Complete
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