usb hard drive not claimed by any active driver

[Mindy Preston]

I recently purchased a Lacie 500GB "EXTREME!!!!" big disk.  (Is it just 
me or has extreme marketing gone too far?)  I was able to plug it in, 
fdisk it, and set up a partition on my Ubuntu machine, so I know the 
drive is good.  When I went to set it up on my end user's RHEL 3 U6 
machine, however, here's what I got in dmesg:

hub.c: new USB device 00:1d.7-4, assigned address 2
usb.c: USB device 2 (vend/prod 0x451/0x6250) is not claimed by any 
active driver.

I noticed usb-storage wasn't loaded and modprobe'd that, then power 
cycled the drive, but still got the same message.

Tips?  Advice?  Am I missing something obvious?

Thanks,
Mindy Preston