Carry your favorite operating system CentOS, in your bootable external hard disk where ever you go. With CentOS 5.5 Live Hard Disk you can boot into CentOS Live loaded on the hard disk from any computer. The best part is that you will have persistent storage. Unlike in a live CD where you cannot save your preferences or documents you can use your CentOS Live Hard Disk just like you would use your CentOS installed in a computer. Also have the luxury of having the complete CentOS 5.5 32 bit repository right in your hard disk drive so that you would not have to connect to the Internet to install additional software.