From Bugzilla Helper: User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7.5) Gecko/20041107 Firefox/1.0 Description of problem: After installing on a USB drive (in expert mode), RHEL does not boot. The problem is caused by the lack of the USB drivers in the initial ramdisk image (inird). Version-Release number of selected component (if applicable): How reproducible: Always Steps to Reproduce: 1. Install RHEL in expert mode to a USB drive 2. Boot 3. Panic Actual Results: Panic, since root was not mounted Expected Results: Normal boot Additional info: The problem is well known, solution is to add the USB drivers to the inital ramdisk image: http://www.simonf.com/usb/ . Workaround is very time-consuming.
Installs to USB disks are not supported, this is why they're not allowed by default.