I'm trying to install CentOS5 i386 from DVD ISO to my new second SATA drive. I boot from a USB key and tell it to use the DVD image on sda5 (ext3, an FC5 boot partition), installing to a default partition setup on sdb. I tell it to install grub to sda (where my old FC5 grub install lives), with WinXP64 on sda1 as a non-default additional OS. Right after that I get an Anaconda exception that the installation media is already mounted. What now?