Some systems BIOS\'s do not recognize more than 132 MB drive. You should with the motherboard manufacture. Most the newest boards from the past few months should handle them. Check the websites and get the latest BIOS.
You can also use drive overlays (which I personally dislike) if the BIOS doesn\'t support 160 GB drives.
Not to throw a wrench in the works, but...I\'m using a 250gb drive. My motherboard (with current BIOS) only reports it as a 135, but by setting the Windows registry for Large Bit Addressing I am able to use all 250gb. I don\'t understand why, but it works. I posted a question about this awhile back with little response. By the way, what are drive overlays?