So, I got me a cheap santa rosa macbook pro and upgraded to the 320GB seagate drive as mentioned in another thread here. I was planning on taking the 120GB drive that was inside it originally and sticking it in my first gen Macbook Pro to replace it's 100GB drive, just to make it a little better for the buyer. But now I'm worried about my warranty, and the warranty left on my older machine which I intend to sell to someone, with the apple care warranty attached again as a selling point. So I don't want to void their warranty by swapping the drive out too. What's the real rule from Apple here? Can I really not swap the hard drive without voiding the warranty? If that's the case, I'm thinking I should keep my 120GB around to put back in in case I have to get it serviced by apple.