WatchDISK can display the current directory size of local or networked drives and unlike most other disk space tools, it can show how those sizes have evolved over time. This allows you to project future storage needs based on current trends and growth patterns and find out why free disk space has suddenly dropped or increased. If you have Microsoft Excel installed, you can also take advantage of visual charts and statistical displays. In addition to the comparison features, the program includes several alert options, allowing you to be notified by message dialog, email, pager or command line if specified disk changes have been detected.

The license of this software is Free Trial Software, the price is $40.00, you can free download and get a free trial.