I'm getting a new computer from work, Late 2011 15in MB Pro (only about 5 months old) from a previous employee. It's got 8GB RAM and 500GB hard drive, but I'm strongly considering an upgrade to this Seagate Hybrid Drive. Was wondering if anyone has experience with this hard drive and if it'd be a good fit for the computer. http://www.amazon.com/Seagate-Momen...0LX003/dp/B00691WMJG/ref=cm_cr_pr_product_top Also, this is my first laptop since my Mid-2008 MB so this question may be stupid. But, when I do install the new hard drive, will I still need an install disk of some kind? I only ask because I know Lion and Mountain Lion are now "download only" and I don't know if that has anything to do with new drive installation.