1)   SpaceObServer 3.3.1 The complete hard disk space manager for Windows 200X/XP/Vista. Scans directory trees and stores structure and size in SQL database. Report of space usage, growth and more in tabular views, bar, pie, line chars, tree map. Integrated file search. 2)   O&O DiskStat Professional Edition 1 O&O DiskStat is a high-power tool for analyzing the used disk space on your storage volumes. With an easy-to-use interface, you can take a closer look at the file and folder structure of your internal and external drives.