Dual boot Vista & XP cant read xp drive

Hi

I did a fresh install of Vista Ultimate on a new Sata drive. My old drive is
now a slave drive on the other controller. The old drive has a working copy
of XP Home on it. It was my original drive for this system.

The problem is Vista cant read any files from the old drive. Vista found the
drive and partitions on that drive and did assign drive letters.

What do I need to do to make Vista recognize Windows XP and be able to boot
to either system?

I wasn't sure if it was a Vista or XP problem so I posted to both groups. My
apologizes if that was inappropriate.

Thanks in advance
Rick