You know you want it. It’s Western Digital’s new 2.5″ notebook hard drive with a whopping 320GB of space, priced at a cool $200. Yeah, it only rotates at 5400 RPM, but what do you expect? It’s only 2007 after all! And they’ll have a 7200 RPM option out before you can say “Dang. I just upgraded my system with the 5400 RPM version and now I hate my life.” Here’s how to swap the drive in your Macbook or Macbook Pro with this new drive (or any other 2.5″ drive) using Leopard’s Time Machine.