Okay... so I'll try to keep this fairly brief. I just received a 320 GB Scorpio Black that I purchased on eBay from a very reputable seller. It is the RETAIL drive, in the box, not an OEM drive. In the auction and on WD's site they state that the Black has a 5 year warranty. Simply put, after entering the serial #, it's 3 years, and only valid from "authorized sellers". The seller has apologized and offered to take back the drive and pay for return shipping, so no problem there, as I have not opened it, but here are my questions: 1. Is WD strict about having receipts to do an RMA exchange if the serial # is valid on their website and is shown to have a warranty? Reason being that I don't have a "authorized seller receipt", but my drive is in warranty on the website. 2. If I were to experience harsh vibrations in my MBP after installing this, is that ground for an exchange? I really don't mind minor vibrations, so if that's all it is, I don't think I'll mind too much. 3. Why the warranty discrepancy? Barring all mistakes from the seller, WD's site contradicts what is coming up. Thanks in advance.