The Acer C: drive is now full and the Data D: drive is empty, but it is not recognizing it automatically. This computer is my brother's, he bought it new and has it at my house. It came formatted with no disc's and I'm not sure where his books for it are. Can anyone tell me how to activate the second hard drive so I can use itunes and download video, etc. It would be very much appreciated. My brother uses the computer here but it has been here for at least 3 years maybe and the book is misplaced. He mostly uses it for youtube, facebook, and stuff like that and is less computer educated than I am at tech stuff, which isn't saying much. Thanks in advance for any help.