In another thread, Rad mentioned the TreeSize utility by JAM Software:  a “powerful and flexible hard disk space manager for Windows.”  I’m using TreeSize Professional, and have found it helpful to answers questions such as:

• Which folders occupy the most space?
  
• Which folders have increased/decreased in size the most (as compared to a prior hard disk scan)?
  
• Which category of files (e.g., system files, audio files) occupy the most space?
  
• What are the largest files on the disk?
  
• Why has the size of an image backup file increased since the prior run?

And, it’s fast.  In about 5 seconds, the utility scans 122,000 files in 20,000 folders, occupying 36GB for my operating system partition.

It’s probably not the type of utility a user will run every day, but I think that many readers of this forum would find it to be valuable.  (There is also a free edition of the tool available, too.)

P.S.:  Kudos to Rad for the reference to this utillity!

For those of us who don't need analytic data about the info on thier disk, but just want a visual representation, I know of Sequoia View (http://w3.win.tue.nl/nl/onderzoek/onderzoek_informatica/visualization/sequoiaview//) and WinDirStat (http://windirstat.info/), both free programs.

Pleonasm wrote on Jun 1^st, 2009 at 9:15am:

P.S.:Kudos to Rad for the reference to this utillity!

treesize rocks.

takes mine longer, tho.

i learned about it from brian.