Those GUIs are fine for building a CD from ordinary files stored on your hard disk--text, data, music and such--but sometimes you need to do the equivalent of copying a CD image onto a new CD. A ...

To do so, just start up Unetbootin and navigate to your disk image as normal, but instead of USB drive, just choose "Hard Disk" from the "Type" dropdown as shown above. Leave / for the Drive entry.

If you're looking to build a custom Linux disk image that's based on Ubuntu, ... Jack Wallen is an award-winning writer for TechRepublic, The New Stack, and Linux New Media.