I'm on 10.6.8 on a mid-2010 Macbook Pro. I'm considering upgrading to Mavericks, but before I do so, I'm told that I should first run Disk Utility and make sure everything is in order. As it turns out, everything is NOT in order - when I run Disk Utility, I get a "this disk needs to be repaired." I don't have an installation disc any longer - it's been three years since I bought the damn thing - so I can not repair the disk the old-fashioned way. Guess I'm down to three alternatives: 1. Give up on Mavericks, and keep on truckin' in 10.6.8. 2. Buy a new 10.6.8 installation disc, repair the disk and then upgrade to Mavericks (!?). 3. Find some kind of work-around, which allows me to safely upgrade to Mavericks without first buying a new 10.6.8 installation disc (!?). What say you, folks? Between the three, what would y'all recommend?