Someone told me that I can't upgrade my samsung rv518 laptop's internal HDD. Is that correct? My hard disk is making strange sound while working and I think it doesn't have much time left. Now I have a 500 gb HDD and I want to upgrade it to 1 or 2 tb. Is this possible because that person told me that I can only replace my HDD with another 500 gb HDD and can't upgrade it. Please help.