External Hard Drive with e SATA

I run Vista Home Premium on a self build computer with an Asus P5B Delu
motherboard. It has an e SATA socket and I recently bought a Caddy fo
an External Drive to use as a back up with Windows Live OneCare. Th
drive is a 320G Seagate SATA2 ST3320620AS identical to the interna
drive in my computer and the Caddy has eSATA and USB2 sockets

Everthing works fine if I connect via USB2 but the external drive i
not recognised when I connect with eSATA

It may not make a lot of difference in practice but I would still lik
to be able to use eSATA.

Does anyone know why the e Sata drive isn't recognised
Is this a Vista problem or perhaps there is a setting that need
adjusting

Your comments and advice would be appreciated

--
gemius