Follow External Mount Points and Symbolic Links

You can decide if TreeSize Professional should follow symbolic links and mount points (see Notes on NTFS for additional information) that point to other drives or folders on other drives. Links that point within the scanned directory will never be followed in order to prevent circular references and folders from being counted twice.

Track NTFS Alternate Data Streams and Hard Links

With this option you can control, if TreeSize Professional should check each file if it is just a hard link to another file or if contains alternate data streams (ADS). The will result in more accurate results for the allocated space, but will also slow down the speed of a scan.

Show Error Messages

Use this option to decide if TreeSize Professional should show error messages during scanning. If you for example scan a network drive on a Windows  server and don't have reading access to all folders, Windows will pop up an error message for every unreadable folder. If you don't want the scanning process interrupted by these message boxes, deselect this check box.

Create Statistics on File Extensions

If this check box is activated TreeSize Professional will additionally generate a statistics for the file extensions in each subtree. The results can be viewed on the Extensions tab of the main window, where you are also able to filter the values in the directory tree by one file type.

Create Statistics on File Owners

If this check box is activated TreeSize Professional will additionally generate a statistics for the file owners in each subtree. The results can be viewed on the Users tab of the main window where you are also able to limit the values in the directory tree to one of the users. Since it is necessary to query the owner of each file, this option will slow down the scanning process if activated.

Thread Priority

Allows to define the priority with which the threads are running that are scanning the hard disk. Idle means that they use the CPU will be used only if no other threads are using it. Idle is a good setting if you want to make sure that a scan with TreeSize Professional has no impact on the performance of the PC or server. The default and recommended value is "lower priority". Choosing higher priority will result in the scan threads having a higher priority than the thread of the user interface, which can make the user interface unresponsive during a scan. This setting is also used for the threads of the TreeSize File Search.

Maximum Number of Threads

TreeSize Professional automatically adjusts the number of threads to the CPU usage. This option lets you define the maximum number of threads that will be started for a scan. If the system load is high, fewer than the maximum number of threads may be started.

User Defined Cluster Size

Use this option to see what the values for allocated and wasted space would be with a different cluster size or file system. Changing this option will require a rescan. This options will not be saved when you exit TreeSize Professional in order to avoid wrong results when using it the next time.