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  1. System Software, Virus Protection, and File Management What Software Runs Your Hardware? Chapter 4

  2. Student Learning Outcomes • Define the role of system software and the three main types of system software. • Describe the role of your operating system software as it manages peripheral devices and memory. • List and describe the different personal operating systems for notebook and desktop computers, PDAs, and tablet PCs. • Define the role of utility software as it relates to your operating system software. ©2003 The McGraw-Hill Companies

  3. Student Learning Outcomes • Discuss why anti-virus software is so important. • Define the relationships among device letters, filenames, extensions, and folders in managing your information. • Describe the types of utilities you can use to compress and decompress files. ©2003 The McGraw-Hill Companies

  4. Introduction Without system software, your computer equipment would be useless. System software is simply all the instructions that your computer processes regardless of what application software you are using. ©2003 The McGraw-Hill Companies

  5. System Software • Task manager for your entire computer • Gets computer going upon booting • Notifies printer when you want to print • Manages system resources • Three main categories: • Operating system software • Device drivers • Utility software ©2003 The McGraw-Hill Companies

  6. 4.1 Operating System Software • Operating system software is system software that controls your application software and manages how your hardware devices work together • SimNet Concepts Support CD: “What is an Operating System” ©2003 The McGraw-Hill Companies

  7. Types of Operating Systems • Different technology platforms require different operating system software Personal Operating Systems Multi-User Operating Systems Network Operating Systems ©2003 The McGraw-Hill Companies

  8. 4.2 Personal Operating SystemsMicrosoft Family Microsoft Windows XP Home (Windows XP Home) Microsoft Windows 2000 Millennium (Windows 2000 ME or Windows ME) Microsoft Windows 2000 Professional (Windows 2000 Pro) Microsoft Windows XP Professional (Windows XP Pro) ©2003 The McGraw-Hill Companies

  9. Microsoft’s Windows XP Home Create unique users for the same computer • SimNet Concepts Support CD: “The World of Windows” p.4.102 Fig. 4.5 ©2003 The McGraw-Hill Companies

  10. Popular Operating Systems Non-Microsoft • Mac OS • For Apple computers • GUI similar to Windows • Can "speak" password with newest release • SimNet Concepts Support CD: “Other Operating Systems” and “The World of Macintosh” ©2003 The McGraw-Hill Companies

  11. MAC OS • SimNet Concepts Support CD: “The World of Macintosh” p.4.103 Fig. 4.6 ©2003 The McGraw-Hill Companies

  12. Popular Operating Systems Non-Microsoft • Linux • Open-source operating system • Mainly used on high-end workstations and network servers • Can be either a personal operating system or a network operating system ©2003 The McGraw-Hill Companies

  13. Operating Systems - PDAs • Two most popular types of PDAs are: • Palm and Handspring • Uses the Palm Operating System (Palm OS) • Pocket-PCs. • Uses Pocket PC operating system ©2003 The McGraw-Hill Companies

  14. Operating Systems - Tablet PCs • Primary choice for an operating system on a Tablet PC (any brand) is Microsoft Windows XP Tablet PC Edition ©2003 The McGraw-Hill Companies

  15. 4.3 Device Drivers, Utilities, and Virus Protection • Working effectively and efficiently with a computer you will need these tools: Operating System Device Drivers Effectiveness And Efficiency Increased Utilities Virus Protection • SimNet Concepts Support CD: “Utilities” ©2003 The McGraw-Hill Companies

  16. Device Drivers • Device Drivers is software and information that enables your operating system to establish the communications between your existing hardware and your new device • Device drivers are available for printers, displays, CD-ROM readers, diskette drives, and so on ©2003 The McGraw-Hill Companies

  17. Device Drivers – cont. • Many device drivers are built into the operating system that comes with your computer. However, if you later buy a new type of device that the OS didn’t anticipate, you will have to install the new device driver ©2003 The McGraw-Hill Companies

  18. Utility Software • Provides additional functionality to the operating system • Example: File Security software to protect files and folders of information as well as to enable you to send secure e-mail messages p.4.106 Fig. 4.8 ©2003 The McGraw-Hill Companies

  19. Anti-virus software continually scans RAM, storage devices, and incoming files for viruses and removes the viruses Viruses can be of two types: Benign Malignant Anti-Virus Software ©2003 The McGraw-Hill Companies

  20. 4.4 File Management • File • Collection of information • Most of the information you work with is stored in files • File management • Keeps track of files • Helps you manage the files on your computer ©2003 The McGraw-Hill Companies

  21. File Naming Conventions • Filename unique name given to a file of information • Filename extension further identifies the contents of a file by specifying the file type. Examples of extensions include: • Word – doc • Excel – xls • Access – mdb • PowerPoint - ppt ©2003 The McGraw-Hill Companies

  22. File Naming ConventionRules p.4.110 Fig. 4.11 ©2003 The McGraw-Hill Companies

  23. Organizing Files • File manager utility software • Manage and organize files • Find and copy files • Move, rename, and delete files • Identify storage devices with device letters • Unique identifier for each storage device What letter is used for the floppy disk drive? The hard disk? ©2003 The McGraw-Hill Companies

  24. Identifying Storage Devices with Device Letters • Device letter is a unique identifier for each different storage device on your computer • Floppy disk: A:\ • Hard disk: C:\ • Other storage devices will be assigned different letters depending on the computer and the operating system used p.4.111 Fig. 4.12 ©2003 The McGraw-Hill Companies

  25. Directories and Folders • Directory • A list of files on a particular storage device • Main directory is called the root directory • Folder • Special portion of your root directory into which you can place files that have similar information • Can have folders within folders • Called subfolders ©2003 The McGraw-Hill Companies

  26. C:\ Finance Finance Finance 3212 Finance 4032 Folder Structure p.4.112 Fig. 4.13 ©2003 The McGraw-Hill Companies

  27. Pathname A:\Finance\Finance 4032\Finance Final Analysis.xls Folder Filename Subfolder Device letter Extension ©2003 The McGraw-Hill Companies

  28. File Allocation Tables (FAT) • File allocation table (FAT) table that an OS maintains on a hard disk that provides a map of the clusters (basic units of logical storage on a hard disk) that a file has been stored in • When you write a new file to a hard disk, the file is stored in one or more clusters that are not necessarily next to each other; they may be rather scattered over the disk ©2003 The McGraw-Hill Companies

  29. File Allocation Tables – Cont • OS creates a FAT entry for the new file that records where each cluster is located and their sequential order • When you read a file, the OS reassembles the file from clusters and places it as an entire file where it can be read ©2003 The McGraw-Hill Companies

  30. File Fragmentation • Fragmentationoccurs when your computer places parts of files over many disks areas or clusters • Fragmentation over time can slow data access (each fragment of a file must be accessed for the entire file to be read), the user may use a defragmentation utility so that the data on the storage medium can be reorganized – a process known a defragmentation ©2003 The McGraw-Hill Companies

  31. File Compression • File Compression is the shrinking of a file into a smaller file • In order to use a compressed file, it must be decompressed back to its original size • The file size is controlled by setting a file compression ratio. A file compression ratio determines how small the compressed file will be • WinZip is a popular Windows program that compresses and decompresses files ©2003 The McGraw-Hill Companies

  32. WinZip Compression Utility p.4.115 Fig. 4.15 ©2003 The McGraw-Hill Companies

  33. 4.5 Consumer Q&A • How Can I Upgrade My Operating System Software when a New Version is Available? • If I Receive a Zipped File as an E-mail Attachment, How Do I Decompress it? • Which PDA Operating System Provides the Best Compatibility with My Computer’s Operating System? • Figure 4.9 Mentions Cookies – What Are They? ©2003 The McGraw-Hill Companies

  34. 4.5 Consumer Q&A • How Often Do I Need to Scan My Hard Disk for Viruses? • Can I Compress Multiple Files into a Single Smaller File? • What Happens if a Virus Attacks My File Allocation Table File? ©2003 The McGraw-Hill Companies

  35. ©2003 The McGraw-Hill Companies

  36. Anti-virus software Defragmentation utility Device driver Device letter Disk compression utility File File compression software File manager utility software File security software Filename Filename extension Folder Hot swap Linux 4.6 Key Terms ©2003 The McGraw-Hill Companies

  37. Mac OS Windows 2000 ME Windows 2000 Pro Windows XP Home Windows XP Pro Microsoft Windows XP Tablet PC Edition Multi-user OS Multitasking Network operating system Operating system software Palm Operating system 4.6 Key Terms ©2003 The McGraw-Hill Companies

  38. Pathname Personal operating system Plug and play System software Utility software Utility software suite 4.6 Key Terms ©2003 The McGraw-Hill Companies

  39. Review of Concepts • Exploring Your Control Panel • How do you set the blinking rate of your cursor? • Understanding File Storage • Can you track files in a FAT? ©2003 The McGraw-Hill Companies

  40. Hands On ProjectsE-Commerce • Researching Anti-Virus Software • Finding Student Loans • Money is waiting for you • Locating Games • What are the most popular gaming sites? ©2003 The McGraw-Hill Companies

  41. Hands On ProjectsEthics, Security & Privacy • Content Filtering on the Internet • Should your school be allowed to filter your Internet travels? • When is a child too old to have parents filtering content? • Can you filter the content of your spouse? ©2003 The McGraw-Hill Companies

  42. Hands On Projectson the Web • Researching Disk Backup Utility Tools • Protecting Yourself with a Firewall ©2003 The McGraw-Hill Companies

  43. Hands On ProjectsGroup Activities • Building Your Own 3-D Screen Saver • CubeShow makes it happen • Finding Out More about Tablet PC Operating Systems • Finding Files on Your Hard Disk • Your School’s Operating System Software ©2003 The McGraw-Hill Companies