Just thought I'd have a look to see how badly fragmented my four week old iMac HDD actually is. I downloaded the demo of iDefrag, did a scan and 64% of the HDD is fragmented, some files over 11,000 fragments, 102GBs used. iDefrag I have to pay for, and it will not defrag mounted drives. Which means that the HDD in my iMac cannot be dismounted as it has to be mounted in order to load the OS (I have no other HDD to attach). So, anyone know of any FREE utils, or anything such a s a command line that will derag my HDD?