Burning ISO Images to Disk
When you download Ubuntu or other Linux distributions from the Internet, you usually download them in the form of one or more disk images, which are commonly referred to as ISOs because such files end in the .iso extension. An ISO is an image of a CD's file contents, which means that it is the CD minus the media itself. To put it another way, if CDs had souls, the ISO would be the soul of a CD; take away the CD's metal and plastic, and the remaining data would be an ISO.
As it is impossible to download a physical CD over the Internet, the bodiless ISOs are the next best thing. For example, to get a working copy of Ubuntu from the Web, you need to download an ISO, which you then burn onto a blank CD in order to give the ...
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