Firewire Drive shows in Startup Disk -- But not with Option

I just added a new firewire backup drive. It's the only ext. drive attached. I ran SuperDuper to make a bootable clone of my startup drive. The drive shows up in Startup Disk, with the proper OS, 10.4.11, same as my int. drive.
But when I restart and hold down the option key, only my int. drive shows up.
What do you think is going on?
Thanks

From Western Digital's support web page [HERE|http://wdc.custhelp.com/cgi-bin/wdc.cfg/php/enduser/stdadp.php?pfaqid=1715]:
====
Power PC based Macintosh computers are unable to boot to a My Book external hard drive.
Question
Why am I unable to boot to a WD My Book external hard drive using a Power PC (PPC) Based Macintosh computer?
Answer
Problem:
Power PC based Macintosh computer systems are unable to boot to the following My Book external hard drive:
* My Book Pro II Edition
* My Book Premium II Edition
* My Book Home Edition
* My Book Studio Edition
Intel Macintosh computers are not affected by this issue and are able to be booted from My Book external hard drives if the partition on the drive has been setup as a GUID partition scheme.
Cause:
This issue is a Macintosh bug cause by the Mac ROM code of the computer and how it attempts to boot from the first SCSI LUN it detects (LUN 0). In the case of the aforementioned hard drives, the LUN 0 device is dedicated to the button board and safe removal tools of the hard drive case and not the internal hard drive, thus causing booting to be impossible.
Resolution:
There is currently no resolution to this issue. If a resolution is found by Apple, this answer will be updated with this information.
=====
Unbelievably, they blame Apple for the problem.

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