This should work
Try putting the drive in your Mac and hold Alt (or Option for Apple keyboards) on startup. But put the Windows XP disk in the Mac first. You should see your XP disk. Select it. Hopefully XP will load and see your SATA drive. If it does, install on it. If it doesn't, post back here with your Mac's model, year and version of your Mac OS X (I'm assuming you have Mac OS X, tell us if you don't).