Hi all, I'm running OSX Mavericks on my Mac Mini mid-2011 with 8GB of RAM and the HDD it came with, a 500GB HDD. The HDD seems to be under a lot of strain. How can I check how much strain it's actually under? I think the HDD that came with it is a 5400RPM drive. Would it make a difference if I upgraded it to a 7200RPM drive or would I need to get an SSD to really see a difference? By the way, if I formatted the MacMini HDD and then use the external USB 1TB drive with Time Machine to restore it, what would happen? It feels like a lot of 'cruft' has built up over time and I use this machine often. I haven't re-formatted it since I first bought it in April 2012. Would this make a difference or would I just be putting all the files back where they were? Thank you for any help!