All, I just dropped in a WD Scorpio 7200 320GB drive in my mid-2009 mbp. I successfully cloned my previous drive. It took forever to boot the first time and every subsequent time. It takes hours to install the os fresh after wiping it. Not at all how I expected the swap to go. What do you all think? Swap it out for another because this one is a bad egg? I have done a guid partition and it is formatted in mac os x extended and journaled. When i boot from my old drive, now in a usb enclosure, everything is fine. However when I access the new internal drive it hangs and just doesn't play well with it at all. Any thoughts before i return and exchange?