To get inside, you will be voiding the warranty, i say this because you will have to remove a warranty sticker to get to one of the screws, there may also be some glue holding it together, Id recommend getting a new external HD chassis and just plugging it into that instead of trying to repair the old one. (unless your comfortable with a soldering iron).
You could just take the HDD out at plug it into your computer as its just a normal sata HDD with a USB converter.