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C HAPT ER 8 GETTING EV ERYTHING UP A ND RUNN IN G
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Spinning Down the Hard Disk
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All modern hard disks come with the ability to spin down their motors to save energy. Then, when data is requested, the motors spin up again. There may be a slight delay while this happens, and some people dislike using disk spin-down because of this. However, on a notebook, it can lead to a substantial increase in battery life. On a desktop system, it s worth considering, because over the lifetime of a computer, it can save a lot of electricity (and therefore money!). The spin-down settings are contained in the /etc/hdparm.conf file, which you ll need to edit by hand. Follow these steps to adjust the spin-down settings:
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1. Open a terminal window (Applications Accessories Terminal) and type
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the following:
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gksu gedit /etc/hdparm.conf 2. Click Search Find, and in the box, type spindown_time. 3. Click the Find button. You should find that a line in the file is now highlighted.
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Close the Search dialog box.
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4. Change the line to remove the hash mark from the beginning, so it reads like this: spindown_time = 24
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You can alter the value to anything you want. Each time unit is five seconds, so 24 equates to 120 seconds (24 5 seconds) or 2 minutes. To set a time of 20 minutes, enter 240 (240 5 seconds). If you specify a number above 240, the time units are increased to 30 minutes. In other words, a value of 241 will equate to 30 minutes, a value of 242 will equate to 60 minutes, and so on.
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5. When you ve finished, save the file. 6. Reboot for the settings to take effect.
POWER SAVING: IS IT WORTH IT
An average computer draws anywhere between 100 to 1,000 watts of power. An average incandescent light bulb draws around 150 watts of power, so you can see that, relatively speaking, computers are low power consumers compared to many household devices. However, it s still worth considering employing power-saving techniques. You might not save yourself a lot of money, but if you switch on power saving, and your neighbor does too, and her neighbor does, then the cumulative effect will add up, and we can all contribute less toward global warming.
CHAPTER 8 GETTING E VERYTHING UP AND RUN NING
Try to avoid leaving your computer turned on overnight or when you re away from it for long periods. As well as saving power, switching off your computer will avoid wear and tear on its components. Although the CPU can work 24 7 without trouble, it s cooled by a fan that s a simple mechanical device. There are other fans in your computer too, such as the graphics card fan and case fan. Each of these will eventually wear out. If your graphics card fan stops working, the card itself will overheat and might burn out. The same is true of the CPU fan. However, by shutting down your computer overnight, you can effectively double the life of the fans and radically reduce the risk of catastrophic failure. Isn t that worth considering
Adding a Printer
Most people have a printer nowadays, and Ubuntu supports a wide variety of models everything from laser printers to color ink-jet models, and even some of the very old dotmatrix printers. If you work in an office environment, you might be expected to access a shared printer. Sharing a printer is usually achieved by connecting the device directly to the network. The printer itself normally has special built-in hardware to allow this to happen. Alternatively, the printer might be plugged into a Windows computer, such as a Windows server (or even simply someone s desktop PC), and shared so that other users can access it, a setup that is known as Windows printer sharing. Ubuntu will work with network printers of both types.
Configuring a Local Printer
A local printer is one that s directly connected to your computer, normally via USB. Any printer you attach to your computer will be configured by Ubuntu automatically and ready to use immediately, as shown in Figure 8-8.
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