What kind of interface does a Dell Inspiron 4150 hard drive have?

I have a dell inspiron 4150 laptop and want to upgrade the hard drive. I have a western digital scorpio blue but the interface isn't right and won't connect to the mother board. So what kind of interface do I need to have on the hard drive?What kind of interface does a Dell Inspiron 4150 hard drive have?Its an IDE.To make sure pull it and check it out.You'll have to take it out anyway to swap it.What kind of interface does a Dell Inspiron 4150 hard drive have?IDE/ATA... NOT SATAWhat kind of interface does a Dell Inspiron 4150 hard drive have?Says Ultra ATA 100 Check this link