MacBook Pro 13" Unibody Late 2011 Hard Drive Replacement - iFixit Repair Guide
Replace your 2009-2012 MacBook Pro HD with an SSD
MacBook Pro (Howto): Install A Solid-State-Drive
Amazon.com: 480GB 2.5" SSD Solid State Drive for Apple MacBook Pro (15-inch, Early 2011) (17-inch, Early 2011) (13-inch, Early 2011) Laptops : Electronics