I just tried to move some critical data from one drive to another and the operation froze. The folder showed up in the destination but then the copy wouldn't start. What was the problem? Apple apparently set its automatic reminder for the Software Update application to a higher priority than the user task. After a few seconds of being frozen, the folder disappeared from its destination and the Software Update window appeared. Why is a background application more important than a file copy that was initiated by the user? What was so important that it had to interrupt my file copy? A Safari point update, something about Digital Camera RAW Compatibility for iPhoto and Aperture 3 (neither of which I use), and an iLife Support point update (which I also don't use). Is there a way to tell OS X that whatever I'm doing with copying or moving files should always have a higher priority than any background tasks?