My computer arrived with a small C drive partition so it stays close to full. It appears Norton 360 v 20.4.0.40 disenables the wondows scheduled defrag in favor of disk optimization in Norton. When I Norton ran disk optimization manually I found it will not run if <15% free space on the disk. The result is that the C drive has not been defragged in years! A notification from Norton 360 when optimization does not run would be helpful. Optimization status in the monthly report would be nice. A popup when it occurs would be better. This may have been fixed in later versions. I updated under my subscription today. We shall see.