This is true for 6.0 as well. The funny thing is that I can replace the DVD drive with a normal IDE CDROM and the install works. I then put back the DVD and I can mount any cdrom and read from it. The problem only exists during the RedHat install for 6.0 and 6.1. I'm not sure about prior releases. I did not have the DVD drive then. When the kernel boots for the install, it detects an unknown device at hdb, with a pile of funny characters. As I said, if I install using a true CDROM drive and replace the CDROM drive after the install the kernel boots and does properly detect the DVD at hdb. The problem only occurs during the install.
This issue has been forwarded to a developer for further action.
Try booting with 'hdb=cdrom'.
Closing bug due to lack of activity.