Hi, I've got the free version of TechTool Deluxe which came with my AppleCare disc. I just ran it on my 2009 27" iMac w/ 12GB RAM, 2TB HD, and aside from the Surface scan test which I skipped, it passed all but the Directory and the Volume Structure scan -- it recommended I download a version of TechTool Deluxe capable of repairing the problems. So, I've verified and repaired permissions via Disk Utility (few results) and I ran it again and got the same results. Just in case it's relevant, I have a 150GB Windows partition on this drive as well as my primary OS X drive. The volume structure error message is: And the Directory scan error message is: Both of these failed. Any thoughts?