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\marginnote{In some cases, your computer will not recognize that the Ubuntu \acronym{CD} or \acronym{USB} is present as it starts up and will start your existing operating system instead. Generally, this means that the priority given to \emph{boot devices} when your computer is starting needs to be changed. For example, your computer might be set to look for information from your hard drive, and then to look for information on a \acronym{CD} or \acronym{USB}. To run Ubuntu from the Live \acronym{CD} or \acronym{USB}, we want the computer to look for information from the appropriate device first. Changing your \emph{boot priority} is usually handled by \acronym{BIOS} settings; this is beyond the scope of this guide. If you need assistance with changing the boot priority, see your computer manufacturer's documentation for more information.}Your computer reads information from a \acronym{CD} at a much slower speed than it can read information off of a hard drive. Running Ubuntu from the Live \acronym{CD} also occupies a large portion of your computer's memory, which would usually be available for applications to access when Ubuntu is running from your hard drive. The Live \acronym{CD/USB} experience will therefore feel slightly slower than it does when Ubuntu is actually installed on your computer. Running Ubuntu from the \acronym{CD/USB} is a great way to test things out and allows you to try the default applications, browse the Internet, and get a general feel for the operating system. It's also useful for checking that your computer hardware works properly in Ubuntu and that there are no major compatibility issues.