Understanding the disk map
The sunburst disk map may look unusual at first, but very soon you’ll get used to it and appreciate all its benefits.
The disk usage map consists of segments. Colored segments are folders, grey segments are files. The wider is a segment, the larger is the object it represents. For your convenience, all segments are sorted by size. The files and folders that are too thin to be visible one by one are consolidated into semi-transparent segments.