If you want to look at how much disk space is being used and what particular large files are on your system there exists many disk space usage analyzer utilities that incorporate information visualization techniques such as Treemaps and Sunbursts to display this information.
There is a conception that Treemaps and Sunbursts are not good ways for displaying this kind of information. A paper at InfoVis 2010 on
Uncovering Strengths and Weaknesses of Radial Visualizations—an Empirical Approach by Stephan Diehl, Fabian Beck, and Michael Burch, found cartesian visualizations outperform their radial counterparts (e.g. sunbursts) especially with respect to answer times.