I bought the 1TB and the tool kit. Got it today. The step by step directions made it a piece of cake. Afterwards I booted up my MacBook Pro off of my system software cd. The new hard drive didn't show up so I called iFixit and talked to Scott. He told me how to format my drive and had me up and running in about 2 minutes. You guys are awesome! My computer works great and I went from a maxed out 500 GB hard drive to a full 1 TB Hybrid hard drive. Thanks for the new lease on life.