My 2011 13-inch MBP is presently running Snow Leopard and sporting the original 5400rpm hard drive. It does what I need it to do for the most part, but performance has been flaky (more hard crashes and forced shutdowns than I'd like). I'm thinking of replacing the hard drive with a Samsung 840 EVO (or Pro) SSD and upgrading to Mavericks -- preferably at once. The laptop is a secondary computer to me, my main machine is an iMac. I'm thinking I'd just drag-n-drop copy data files I want to keep to an external hard drive, then make the swap to SSD. But then what? Can I use the original install disc to format the SSD for Snow Leopard and then upgrade to Mavericks? Or is there a way to pop in the new SSD and format directly to Mavericks bypassing Snow Leopard? I'm looking at this as an opportunity to manually clear out unneeded files, and I don't want to simply "clone" my present HD to the new SSD. I'd like to start fresh. Any tips? Thanks!