SpaceSniffer is a freeWare (or, better, donationWare) and portable tool application that gives you an idea of how folders and files are structured on your disks. By using a Treemap visualization layout, you have immediate perception of where big folders and files are situated on your devices. Treemap concept was invented by Prof. Ben Shneiderman, who kindly permitted the use of his concept into this tool.

Start a scan process and see the overall situation. Bigger are the elements on the view, bigger are folders and files on your disk. You need more detail on a big folder? Just single click on it. The selected element will be detailed with its content.

Need more and more detail? Keep selecting elements and they'll discover their secrets to you. Need a larger view of a small folder? Then double click on it, and it'll zoom to the full extent of the view.

If you need to understand why no more free space is left on the media, keep following bigger elements. Maybe you want to focus only on particular file types... ok. Just type the file type on the filter field (example: *.jpg) and press enter. The view will react and show you only JPEG files.

Want to know if you have old files? Type the condition in the filter field (example: >2years) and the view will react accordingly.

You can also filter on file size, file date and combine all filters (example: *.jpg;>1mb;<3months)

Features:

Fast and easy to use

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

It's freeWare (donations are welcome)