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Maintenance
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Hard drive maintenance can be broken down into two distinct functions: checking the disk occasionally for failed clusters, and keeping data organized on the drive so that it can be accessed quickly
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Individual clusters on hard drives sometimes go bad There s nothing you can do to prevent this from happening, so it s important that you check occasionally for bad clusters on the drives The tools used to perform this checking are generically called error-checking utilities, although the terms for two older Microsoft tools ScanDisk and CHKDSK (pronounced checkdisk ) are often used Microsoft calls the tool Error-checking in Windows XP Whatever the name of
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CHAPTER 8 Hard Drives
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the utility, each does the same job: when the tool finds bad clusters, it puts the electronic equivalent of orange cones around them so that the system won t try to place data in those bad clusters Most error-checking tools do far more than just check for bad clusters They go through all the drive s filenames, looking for invalid names and attempting to fix them They look for clusters that have no filenames associated with them (we call these lost chains) and erase them From time to time, the underlying links between parent and child folders are lost, so a good error-checking tool checks every parent and child folder With a folder such as C:\TEST\DATA, for example, they make sure that the folder DATA is properly associated with its parent folder, C:\TEST, and that C:\TEST is properly associated with its child folder, C:\TEST\DATA To access Error-checking on a Windows 2000 or Windows XP system, open My Computer, right-click the drive you want to check, and choose Properties to open the drive s Properties dialog box Select the Tools tab and click the Check Now button (Figure 831) to display the Check Disk dialog box, which has two options (Figure 832) Check the box next to Automatically fix file system errors, but save the option to Scan for and attempt recovery of bad sectors for times when you actually suspect a problem, because it takes a while on bigger hard drives
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FIGURE 831
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The Tools tab in the Local Disk Properties dialog box in Windows XP
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FIGURE 832
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Check Disk dialog box options
Now that you know how to run Error-checking, your next question should be, How often do I run it A reasonable maintenance plan would include running it about once a week Error-checking is fast (unless you use the Scan for and attempt recovery option), and it s a great tool for keeping your system in top shape
Defragmentation
Fragmentation of clusters can make your drive access times increase dramatically It s a good idea to defragment or defrag your drives as part of your monthly maintenance You access the defrag tool, called Disk Defragmenter, on Windows 2000 and XP the same way you access Error-checking right-click a drive in My Computer and choose Properties except you click the Defragment Now button on the Tools tab to open the Disk Defragmenter (Figure 833) Defragmentation is interesting to watch once From then on, schedule it to run late at night You should defragment your drives about once a month, although you could run it every week, and if you run it every night it takes only a few minutes The longer you go between defrags the longer it takes If you don t run Disk Defragmenter, your system will run slower If you don t run Error-checking, you may lose data
CHAPTER 8 Hard Drives
FIGURE 833
Disk Defragmenter in Windows XP
Disk Cleanup
Did you know that the average hard drive is full of trash Not the junk you intentionally put in your hard drive, like the 23,000 e-mail messages that you refuse to delete from your e-mail program This kind of trash is all the files that you never see that Windows keeps for you Here are a few examples:
Files in the Recycle Bin When you delete a file, it isn t really deleted It s placed in the Recycle Bin in case you decide you need the file later I just checked my Recycle Bin and found 3 GB worth of files (Figure 834) That s a lot of trash! Temporary Internet files When you go to a Web site, Windows keeps copies of the graphics and other items on the page so that the page will load more quickly the next time you access it You can see these files by opening the Internet Options applet on the Control Panel Figure 835 shows my temporary Internet files Downloaded program files Your system always keeps a copy of any Java or ActiveX applets that it downloads You can see these in the Internet Options applet You ll generally find only a few tiny files here
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