I down loaded and installed RDU Permissions. Selected Repair Permissions, received message that they were repaired. Then run OSX 10.06 Utility Repair Permissions. I restarted the computer(IMac 500mhz 512mb ram)using TechTool Pro 3.05 system 9.01, tried to defrag the HD. It defraged the some file and about 1500 spaced then stopped, leaving 2623 open spaces fragmented. How do I get my HD back to normal again??