I have a 160 GB HP pavillion a475c. I'm running out of hard drive. I have about 130 GB of MP3 files, that I really don't use that much but still I want easy access to them. I just had extra RAM installed and so I want to keep this computer. I was thinking of taking my computer in to have an additional hard drive added. What are my options? What can I do to make sure my computer runs as smoothly as possible?