the default HDD you have in that laptop is a 1TB drive (there was no morel indicated) so hard to know if 5400 or 7200rpm, would need to run SPECCy on it, the program may be able to identify the exact model of HDD, swapping it for another depends really hat you have for example with assuming your laptop has a 5400rpm HDD would it be faster to upgrade to 7200 rpm, yes, but value wise it would not be an UPGRADE compared to an SSD. but price comes into play as a 1TB SDD is quite expensive (3-500$) compared to a 1TB 7200 that can be had for 54$ at frys.com
500GB (usually listed as 480GB SSD can be had on a sale for 150-175$