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clean of all of their data as soon as they re received from the manufacturer and then load a corporate image. These images include the OS and any software required for users to do their jobs. Usually, multiple images are created based on business requirements. For example, there might be a base image that includes the OS and any applications that are required by all users at the company (Microsoft Office 2000, for example). In addition, there might be different images for members of the engineering department and for people in sales, configured specifically for those users respective needs. Figure 5-5 illustrates how multiple images might be used. There are two main methods of performing disk duplication. The first is through the use of dedicated hardware. In this method, hard disks are usually removed from desktop computers and attached to a special controller. This controller attaches to one source hard disk and one or more destination hard disks. When the disk duplication operation is started, the controller copies all the data from the source hard disk to the destination hard disk(s). This ensures that all of the information is copied, bit by bit, from the source to other disks. The end result is several hard disks with identical contents. The drives can then be replaced in their original machines for use. Although hardware disk duplicators can be faster than other methods, they can be quite costly. Also, additional work is involved in removing and replacing hard disks from PCs. Disk duplication can also be performed using various software tools. These utilities are usually inexpensive and require no special hardware in order to operate. Two examples are Symantec Software s Norton Ghost (www.symantec.com) and PowerQuest, Inc. s Drive Image (www.powerquest.com). Both of these tools allow you to create an image of one or more partitions on your hard disk and store them in a single file. You can then use the file to restore data to the same or other machines. Utilities are also available for performing selective restores of just a few files. The software utilities can be made extremely useful through the creation of a special network boot floppy a disk from which a machine can be booted and have access to the network. Whenever a machine fails or becomes unbootable, a system administrator can boot the system with the floppy, connect to a network share, and then run the appropriate utilities to reload a default configuration to the machine. Overall, disk duplication methods can be very useful in systems deployment and in PC backups. If you haven t done so already, consider investing in disk duplication methods.
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NOTE: You should be aware of several issues when performing disk duplication in a Windows NT environment. Every Windows NT-based object is given a unique Security Identifier (SID). Objects such as users and files are expected to have unique SIDs in a networked environment. The main problem is that duplicated computers will have the same SIDs as other machines. Although they will operate properly, this duplication can cause various security and usability problems. Fortunately, solutions are available. Most manufacturers of disk duplication hardware and software provide a SID changer utility. For further information on SID issues (and for solutions to the problems they cause), contact the manufacturer of your disk duplication product.
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Computer viruses can cost IT departments and end users a lot of time and frustration. Although the majority of viruses are harmless, some can cause data loss. We covered information about the importance of scanning for viruses in 3. In this section, we ll provide information on some common commercially available virus protection tools. Table 5-10 lists some manufacturers of virus scanning products. The basic purpose of a virus scanner is to automatically find infected files on the local PC. The program does this by comparing disk contents against library files that indicate the signatures of various known viruses. Virus scanners are usually installed on all client machines and are scheduled to run automatically. Figure 5-6 provides an example of a virus-scanning tool s interface. Although this is a good solution for environments with a small number of PCs to manage, there are two main problems with this configuration in large network environments: First, installing antivirus software on client PCs can be time-consuming and generally will require visiting each desktop machine. Second, en-
Company Carmel Software Engineering Central Command Computer Associates DataFellows Network Associates Norman Data Defense Systems Panda Software Symantec
Website www.carmel.co.il www.avp.com www.cai.com/antivirus www.datafellows.com www.mcafee.com www.norman.com www.pandasoftware.com www.symantec.com Vendors of Antivirus Software
Product Carmel Anti-Virus AntiViral ToolKit InoculateIT; InocuLan F-Secure AntiVirus McAfee VirusScan Norman Virus Control Panda AntiVirus Norton AntiVirus
Table 5-10.
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