I have a Toshiba Satellite Pro 4200 Laptop. It has a 6gb HHD, I run several music programs on it along with the usual desktop programs, and I have ended up with only 560mb left. The HDD is simply not big enough so I want to buy a new one, what I don't know is what to get? I want around 20gb min, can I just buy any 20gb 2.5" laptop HDD or do I have to get one specific to my model. And then would I need to change BIOS settings? which also I wouldn't have a clue how to do.