Making a USB Drive Bootable to Install CentOS

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http://www.linuxquestions.org – I have read one article after another, each claiming to be the way. LOL. I'd like to settle for just one. I have several older servers that have Teac CD-224E IDE CD-ROMs that some sites say also read DVD. I'm confused and my normal Admin is on vacation. So... time to learn something new :) I have a small hosting company and the servers are still excellent but the drive to the co-lo is over an hour. I'd like to be prepared to install CentOS one way or another. I wonder if someone could help me make a USB drive bootable and install Centos 6.4? I'd appreciate it. These are the instructions that (HowTos)