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SpaceSniffer is a graphic disc usage utility which will allow you to monitor the use of the disc or discs of your choice portably.
This appears to be a green .exe only software with no need to install, and it runs from a flash drive.
And to explain why I have posted here two short quotes from the short list from the feature page:
It's portable, no installation required, just put the executable somewhere and let's go
and from the banner:It's freeWare (donations are welcomed)
Full info from this website http://www.uderzo.it/main_products/spac ... tures.htmlTested on Windows 2000 XP Vista 7
download from this link http://www.uderzo.it/main_products/spac ... _0_4_0.zip
Also under how to use it, or why would it be usefull a page that covers that http://www.uderzo.it/main_products/spac ... ricks.html