SpaceSniffer is a free and portable application that will scan a drive and give you a visual treemap of the contents on that drive. This is useful for the technician who is trying to clean up data on a system, or is looking to delete/move data from a full partition to another with more space. What’s nice about this program is that you can easily analyze what files are taking up the most space, in a visual manner, and then use the interface to dig deeper into a directory or file.

SpaceSniffer allows you to modify your searches in many ways. You can look for specific types of files, such as .doc, or can look for older files by using a condition such as “2years.” The main menu shows a high level view of your data breakdown, and by clicking on a section you can drill down to see more files and how much space each individual file is taking up. You can even navigate the interface while a scan is in process.

At first glance the layout of your data in a visual manner may seem cluttered or bit confusing, but you quickly get used to it, and the visual aspect helps you hone down unnecessary files with ease.

Here is a the feature set from the Website:

Supports drag and drop
Export module lets you produce customizable textual reports
Intuitive structure layout, multiple views for different media
Zoomable elements, navigate like a web browser
The Windows folders and file popup menu is accessible by right mouse click
It’s possible to restrict the view content by typing simple yet powerful filtering criteria
Lets you temporary tag files with four different colors and perform filtering on them
Different views of the same media can show differently filtered elements
Customizable in geometry, colors, behaviors
You can navigate even during the scan
Smart cached scanning engine, multiple views, single scan
You can refine a zoomed area by a secondary scan process, even with main scan active
Reacts to file system events, keeps always in synch, warns you by blinking elements
Can scan NTFS Alternate Data Streams
It doesn’t clutter your registry, only a plain XML configuration file
It’s portable, no installation required, just put the executable somewhere and let’s go

Main Screen visual file tree
Drill down to Documents

http://www.uderzo.it/main_products/space_sniffer/download.html