Log in to cPanel. Locate the FILES section, then click Disk Usage. After that, bar graphs appear that show relative disk usage by directory. In the beneath the bar graphs, you can view disk usage by directory, in both megabytes (MB) and bytes. Also, you can sort disk usage information in two ways, by directory name(click Name). Or by size(click Disk Usage). You can navigate through the directory hierarchy to view disk usage information for subdirectories. For example, to view a subdirectory, click the > icon next to the parent directory’s name.