On Fri, 2011-07-15 at 10:07 -0400, DV wrote: > I would try the bios setting AHCI (vs. compatibility mode) if you have it. > > http://www.911cd.net/forums/lofiversion/index.php/t23099.html > > This is the SATA Advanced Host Controller Interface: > > http://www.techmetica.com/howto/sata-ahci-mode-bios-setting.-what-does-it-do/ I have all of the SATA channels set to AHCI mode, which includes the Pioneer burner. I was thinking that maybe I should try changing the BIOS setting to IDE, but then tossed it aside as crazy talk. After your email, I decided to change the DVDRW drive's SATA channel to IDE mode. Bingo! The CentOS 6 DVD booted. I have CentOS 6 running and fully updated now. I haven't looked into why the SATA Pioneer DVDRW needed AHCI disabled in order to boot off the CentOS 6 DVD. Since the Fedora 15 DVD booted without issue, I can only surmise isolinux in CentOS 6 and in Fedora 15 behave differently. Thanks to everyone that tried to help out. I appreciate everyone's efforts. Regards, Ranbir -- Kanwar Ranbir Sandhu Linux 2.6.32.26-175.fc12.x86_64 x86_64 GNU/Linux 12:18:37 up 12:07, 1 user, load average: 0.24, 0.16, 0.08