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Let's say I have explorer open with the folder tree structure in the left hand pane, and the subfolders and files in the right hand pane.

Is there a way that I can see the number of files under the folder, and the total size of all data in the subfolder in the right hand pane?

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I would like to see this as well. You figured they would have built into Windows by now... If you are willing to spend for that feature take a look at zabkat.com/x2facts.htm – snmcdonald Feb 5 '11 at 22:40
    
Unfortunately it is not a plugin but it supposedly shows directory sizes freecommander.com/fc_details_en.htm – snmcdonald Feb 5 '11 at 23:07
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It's not builtin, because all the current methods are not only inaccurate, but they are also IO intensive, considering it is a task users rarely use. Best left up to third party programs. – surfasb Nov 24 '11 at 1:59
up vote 7 down vote accepted

I use FolderSize on a server at work to administrate more effectively. It's essentially a Windows Explorer plugin that allows you to display folder-children, both files and folders along with their size.

http://foldersize.sourceforge.net/

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+1 FolderSize..XP and Windows 2000 only – Moab Jan 3 '11 at 22:35

This isn't possible using the default Windows Explorer, you would need some sort of plugin that aggregates this information (or check them manually). You can, however, get this information from a Command Shell (albeit not in a pretty way) via "dir /S". Run "dir /?" for other options. For example:

C:\Users\Josh\Temp\apache-ant-1.8.1>dir /S
 Volume in drive C has no label.
 Volume Serial Number is D819-69BC

 Directory of C:\Users\Josh\Temp\apache-ant-1.8.1

09/06/2010  06:07 PM    <DIR>          .
09/06/2010  06:07 PM    <DIR>          ..
09/06/2010  06:06 PM    <DIR>          bin
09/06/2010  06:07 PM    <DIR>          docs
09/06/2010  06:07 PM    <DIR>          etc
04/30/2010  06:03 PM             7,920 fetch.xml
04/30/2010  06:03 PM             4,566 get-m2.xml
04/30/2010  06:03 PM               128 INSTALL
04/30/2010  06:03 PM            77,892 KEYS
09/06/2010  06:08 PM    <DIR>          lib
04/30/2010  06:03 PM            15,561 LICENSE
04/30/2010  06:03 PM               224 NOTICE
04/30/2010  06:03 PM             4,216 README
04/30/2010  06:03 PM           197,028 WHATSNEW
               8 File(s)        307,535 bytes

 Directory of C:\Users\Josh\Temp\apache-ant-1.8.1\bin

09/06/2010  06:06 PM    <DIR>          .
09/06/2010  06:06 PM    <DIR>          ..
04/30/2010  06:02 PM             9,997 ant
04/30/2010  06:02 PM             7,706 ant.bat
04/30/2010  06:02 PM             2,857 ant.cmd
04/30/2010  06:02 PM             3,410 antenv.cmd
04/30/2010  06:02 PM               861 antRun
04/30/2010  06:02 PM             1,536 antRun.bat
04/30/2010  06:02 PM             2,199 antRun.pl
04/30/2010  06:02 PM             3,219 complete-ant-cmd.pl
04/30/2010  06:02 PM             4,315 envset.cmd
04/30/2010  06:02 PM             1,116 lcp.bat
04/30/2010  06:02 PM             4,422 runant.pl
04/30/2010  06:02 PM             3,396 runant.py
04/30/2010  06:02 PM             1,817 runrc.cmd
              13 File(s)         46,851 bytes

 Directory of C:\Users\Josh\Temp\apache-ant-1.8.1\docs
...
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There is DIRUSE.EXE as well, which does the job a lot better. I think I must have got it from the Windows Server 200 or 2003 Resource Kit. – paradroid Jan 4 '11 at 1:28
    
DIRUSE is not available for versions of Windows after Server 2003. – O.M.Y. Jun 26 at 1:47

For anyone else who may stumble on this question and need an answer - DU from sysinternals

Similar in usage to the unix utility.

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I love DU but the OP wanted something that would work in his Explorer display (or I presume an Explorer-like display). DU produces text only. – O.M.Y. Jun 26 at 1:46

If anyone else is looking for something there is a free tool to use http://www.jam-software.com/treesize_free/

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