Ok, i have upgraded my stock HDD last winter to a Hitatchi Travelstar. I have this stock one sitting in the static bag, and was wondering if anyone holds on to this for warranty purposes, or if you guys just sell it, and try your luck with the new one? I see that there is an Apple sticker/label on the HDD. This HDD seems pretty common in the MB/MBP line (Fujitsu 250GB 5400RPM). My theory is if i sell it and something does go wrong, i could buy another HDD to put it in before sending to Apple OR just send in my MBP the way it is and if they send it back saying the HDD isn't stock, then just go change it out and re-sent it in. Thoughts? Just trying to sell stuff extra that i have to fund plane tickets and photo gear, etc.