You can use Disktective to trace your lost disk space. Find out the real size of your directories. They may contain hundreds of subdirectories, each containing many files. Simply run Disktective, and it will create a complete report displaying the real sizes of all directories and their containing subdirectories.
What’s new in this version: Version 6.0 added when Disktective uses megabytes or kilobytes (as specified in the configuration screen) and some amount is rounded to zero megabytes or zero kilobytes (but the actual amount is not zero bytes), ‘+0′ is displayed (instead of just ’0′).