This interface displays information about how you use your account's disk space, and all of your home directory's subdirectories. It also helps you manage your disk space quota, because it displays files and directories that use large amounts of hard disk space.
This interface also displays disk usage information about individual files and directories that the subdirectory contains.
2) Navigate to the right navigation pane, under "STATISTICS", and select the link "Disk Usage":
3) Here you can view detailed information regarding disk usage: