Try testing it on local filesystem (like ext3).
Make sure you have a lot of files and lots of subfolders so they make up the 
difference.

** Description changed:

  Binary package hint: gnome-utils
  
  I've noticed the baobab (aka Disk Usage Analyzer) is not reporting sizes of 
directories correctly.
  I my particular case all scanned subfolders are readable (and even writable) 
for user, so that is not a problem.
  
- From what I can tell, it calculates the size by scanning it's largest 
sub-folders and summing them up.
- This however leads to errors, when there exist large number of smaller 
directories of files one or more levels down. The calculations apparently 
discard these as unimportant, yet those numbers add up and may make quite a 
difference.
+ After a few tests I concluded bug is within the gnome-utils package of 
versions 2.24.1 and up. I tried compiling number of versions on the same 
system, and it showed that older (2.20.0.1) have no such bug, only later 
versions. (A regression bug?)
+ Anyway bug in dependent libraries is unlikely, cause in test all versions 
were linked against the same external libraries.
  
- I've attached a screenshot to this bug.
- Focus your attention on "misc" size in baobab vs. nautilus.
- And also "windisk" size against Volume size in misc's properties. (there is 
only 5 GiB free)
+ There are bunch of screenshots added showing the bug.
+ Most screenshots show bug on NTFS patritions, however I confirmed the same 
bug also on ext3 - so it is also unlikely to be filesystem specific.
  
- I think the size calculation must be adjusted (even if that would mean longer 
scanning times).
- Accuracy is more important than speed.
- 
- Affected platform:
- Ubuntu 8.10 (Interpid) with Linux 2.6.27-11 generic amd64
- Baobab 2.24.1 from gnome-utils package 2.24.1-0ubuntu1
+ Affected:
+ gnome-utils baobab 2.24.1 and later (at least up to 2.26.0)
+ on all tested platforms (those currently being x86 and x86_64)

-- 
Baobab reports incorrect sizes
https://bugs.launchpad.net/bugs/341141
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