Bet ya I got all of you wondering on this one !!! I usually do a boot time defrag after I have done a few software installs and/or uninstalls. I usually clean all my temps and caches out first, do a registry clean up, and then a regular defrag. I will then defrag my registry and then schedule both a CHKDSK and boot time defrag for the next reboot. It seems seems that every single time that I do the CHKDSK it says I have a "dirty volume", then goes ahead and checks the disk. If there were any problems, it does not list any or anything that was fixed. Now the questions: What exactly is a "dirty volume"? What problems can a "dirty volume" cause? What can I do to prevent a "dirty volume"? If CHKDSK is not fixing it, what can I do to fix it? Any ideas anyone?