From: David david@adurotec.com
Has anyone successfully built a USB key for installing centos5.5 either manually or using a tool like unetbootin? I am trying to create one using the 64bit install DVD iso and so far the USB either won't boot (unetbootin) or the installation aborts after I select the iso location on the USB key (manual).
http://wiki.centos.org/HowTos/InstallFromUSBkey Either you can do most of it "manualy" (and learn a few things), or you use others scripts/programs (seeAlternatives at the bottom)...
JD