Even on disks formatted under Windows NT, there have been occasions when the Redhat 6.0 install has given the message "Boot failed" while in the "Loading vmlinuz..." stage. Using another disk, or re-formatting and rawriting again will fix the problem. It appears something is being very sensitive, so it would be nice if rawrite had an option to verify that an image has been correctly written to disk.
Thank you for your suggestion. It has been noted and will be considered for the next release.