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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 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 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 of 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 1058) to display the Check Disk dialog box, which has two options (Figure 1059) 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.

Using the user s guide or online sources, determine the exact cleaning procedures for your laser printer How often should it be vacuumed Do any parts need to be removed for cleaning Does the manufacturer recommend any specialized cleaning steps Does your printer come with any specialized cleaning tools Does the manufacturer have any recommended cleaning tools you should purchase Based on the information you gathered, create a cleaning toolkit for your laser printer Be sure to include a vacuum Locate sources for these products and determine the cost of the toolkit

ESD protection devices help to ensure a longer and more productive life for your PC components These devices include antistatic wrist and ankle straps, antistatic mats, antistatic floor mats, and antistatic bags Antistatic devices make your body s electrical potential the same as the electrical potential of your PC or component

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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

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 monthly maintenance You access the defrag tool that runs with Windows 2000, XP, and Vista, called Disk Defragmenter, 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 Defragmenter (Figure 1060) 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 Errorchecking, you may lose data

Determine the model number of the toner cartridge Locate an online company that sells brand-name (such as Hewlett-Packard) toner cartridges Locate an equivalent third-party toner cartridge Assuming that the printer uses a toner cartridge every three months, what is your annual cost savings per system using third-party toner cartridges All toner cartridges have a material safety data sheet (MSDS) Locate the MSDS for your model of toner cartridge and read it Note any potential hazards of the toner cartridges Print out the description of the cleaning kit you created as well as the manufacturer s cleaning instructions

Electrical potential Everything has a certain electrical potential, or how charged it is relative to the zero ground of the Earth Note the term relative If your body has a +3000-volt charge and you touch a component that also has a +3000-volt charge (working in the International Space Station, perhaps ), no damage will occur As far as you and the component are concerned, you re at the same electrical potential Touch a component that has a 3000-volt charge, on the other hand, and watch the sparks fly! One of the most important steps you can take to prevent the effects of ESD is grounding yourself before you handle PC components Do this by touching a metal surface such as the exterior of the PC power supply before touching any of your system components

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:

Mike Meyers CompTIA A+ Guide: PC Technician (Exams 220-602, 220-603, & 220-604)

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