In addition to the primary file classification results, DiskSorter Pro allows one apply numerous types of second level file filters capable of categorizing the file classification results by the file size, the user name, the last assess time, last modification time and file creation time. After finishing the file classification process, DiskSorter performs automatic file categorization and fills the list of detected file categories, which is located just under the category view in the main GUI application.

By default, DiskSorter categorizes file classification results by the file size and shows a list of size-based categories sorted by the amount of used disk space. For each category, DiskSorter shows the number of files, the amount of used disk space and the percentage of the used disk space relative to other file categories. Use the 'Categories' combo box to categorize files by the user name, last access time, last modification time or creation time.

One of the most useful features of DiskSorter is the ability to apply a second level file filter to the file classification results. For example, in order to see all the documents that were created 2-3 months ago, open the 'Documents' file category in the main view, select the creation time-based file categorization mode and double-click on the 'Files Created 2-3 Months Ago' file category. DiskSorter will filter the currently displayed file category and show all documents that were created 2-3 months ago.