I can't envision it being the MyBook, it is possible that the RHEL only talks to IDE and SATA controllers to find storage mediums and not looking at the USB controllers. It is also possible that there is a setting in the bios to have the USB controllers more visible, perhaps setting the bios to "plug N play OS enabled" or similar. I think it is possible to have RHEL see the USB drive by having the right settings enabled in the bios. The bios is sort of fragile and should not be tampered with blindly, it would be best to visit your computer manufacturer's web site, or the mother board manufacturer's site and obtain a manual for the mother board/bios settings which can usually be downloaded in .pdf (Acrobat reader) format to get an in depth explanation of all the different options available in the settings.
Sometimes the computer manufacturer does not tell you which mother board is installed, you can open the box and see what is written in between the expansion slots, if there is some kind of model number there, it is probably an Asus mother board. Or you can just put those model numbers in the google search field and google might drop the right clues.
Just one avenue to walk in an effort to get it to happen, as I'm sure it can happen.
EDIT: Also, while you are at the manufacturer's site, check to see what the latest bios update has to offer. Most mother board manufacturers are like any other corporation, they pust the product out the door as soon as possible to beat the competition, most often there are bugs and features missed, and these features will be taken care of with a revision, if your bios has had a revision, read what features have been fixed or added to see if it applies to your situation, if so, you may want to apply the flash update for the bios.
Last edited by Junior Hacker; 04-14-2007 at 10:34 PM.