Windows 7 - WinDirStat or SequoiaView

Both programs are based on TreeMaps
If you prefer the classic look of MS Windows Explorer, then try Directory Report
Directory printer, find duplicate files, rename files, show folder size, and maintain your files - all in 1 tool

I use neither application, instead I use TreeSizeFree.

TreeSize Free - Quickly Scan Directory Sizes and Find Space Hogs

I use Space Sniffer mostly.

A Guy

Can someone help me with the WinDirStat problem... Every time I run a scan of my Hard drive it stops on 50% and shows it as if it has finished all 100%. I had some sudden memory loss on my laptop (all of a sudden a lot of my free disc space disappeared) and I found this software on this forum saying it could identify every bit of memory on your hard drive. Any ideas how to fix this?

Welcome to Seven Forums himatas. Have you tried either of the 2 alternatives in the 2 posts above yours? A Guy

I've tried both on my Windows 7-64 system and I find I like this one better than either of those:

SpaceSniffer, find lost disk space the easy way.

I've tried all 3 of them: on TreeSize Free my laptop froze, and other 2: WinDirStat & SpaceSniffer both can't see 50% of my memory (about 150gb) But on SpaceSniffer it had an option to show the un scaned part and it shows this 150gb part, but I couldn't scan it.