Caution trying to get FolderSize information w/Powershell…

Make sure to roughly test all Powershell script you may download from the Internet (even the ones I’m putting in my blog).  I just found a couple of sample that will help display a list folder size (which Windows Explorer won’t provide).  Unfortunately the results displayed wasn’t perfect.  I had to use Windows Explorer to verify size information by doing the right-click on the folder to compare the results.  Is this a bug? or just a mistake when creating complex cmdlet.

The problem is that, in most cases, the folders listed are fine.  I only caught this issue when listings folders that contains lots of subfolders. 

Here are some Powershell samples:

1. Powershell (PS) script code from the Internet: (building a function)

Function getFolderSize{
$items = Get-Childitem $args
foreach($item in $items){
if ($item -is [System.IO.DirectoryInfo]){
    Add-member -inputobject $item -membertype ScriptProperty -Name Length -Value{$a = `
    get-childitem $this.FullName -include *.* -recurse | measure-object -sum Length;
    If($a -eq $null){return 0;} else {return $a.sum}}
    write-output $item

This code work but still doesn’t give you 100% correct information(maybe about 80%).

2. Another PS script I retouched from another source: (building a function

Function DisplayFolderSize {
$folderTree=get-childitem $args;
[double] $fsize = 0;
[double] $fsz = 0;
[double] $TotalFSZ = 0;
Write-Host "";
Write-Host "Get Foldersize for $Args";
write-host "————————";
foreach ($folt in $folderTree) {
    if($folt.mode -match "d") {         
         $fsz=((get-childItem $folt.fullname -recurse | Measure-object length -sum).sum);
         $fsize="{0:N2}" -f $fsz;
         write-host ("$fsize `t `t `t `t $folt ");
         [string] $FolderRecords = $FolderRecords + $ + "," + $fsize + "`r`n";
write-host "————————";
write-host "Total Foldersize";
write-host $TotalFSZ;
write-host "";

This code gave me better result but still not a 100% correct information (maybe 90%).

3. Now, here’s the winner.  I created this PS script using the "Scripting.FileSystemObject" COM object.  This way I can create a collection of members for the folder I’m querying the information. (notice this is not a function)
The following lines you can execute line at a time or just create a PS script file or create a function.

## objFolderSize.ps1                                              ##
## Author: Max Trinidad, 02/07/2008                    ##

$FolderName = Read-Host -Prompt "Enter Foldername: "
$FileSystem = new-object -com "Scripting.FileSystemObject";
$getFolderAttr = $FileSystem.GetFolder($FolderName);
$getSubFolderAttr = $getFolderAttr.SubFolders
$getSubFolderAttr | select name, size | ft -auto

## end of script##This code gave me a 100% correct information.

I did gather the results of all three PS scripts and copy/paste them into Excel.  Then I verify the folder size result against Windows Explorer making the #3 PS Script the winner.

Did you notice how many lines of code I use in PS script #3 ?   🙂

Happy coding!!

About maxt2posh

I’m from Puerto Rico, have been working with computers since 1979. Throughout many years, I have worked with SQL Server Technologies, provided support to Windows Servers/Client machines, Microsoft Virtualization Technologies, and build some Visual Studio solutions. I’m a Microsoft PowerShell MVP since 2009 and MVP SAPIEN Technologies since 2010. I speak in most of the SQLSaturday, IT Pro and .NET camps events around the Florida’s State. Also founder of the Florida PowerShell User Group which meeting every 3rd Tuesday evening of the month.
This entry was posted in PowerShell. Bookmark the permalink.

17 Responses to Caution trying to get FolderSize information w/Powershell…

  1. Anonymous says:

    Is there any way to get the 3rd script to display the file lengths in mb or gb?

  2. bjornwork says:

    Hello, and thank you for a great article! As the poster above, I also have problems converting script no 3 as well to megabytes.

    Can it be done in an easy manner?


  3. Anonymous says:

    #Change KB to MB or GB
    $FolderName = Read-Host -Prompt “Enter Foldername: ”
    $FileSystem = new-object -com “Scripting.FileSystemObject”;
    $getFolderAttr = $FileSystem.GetFolder($FolderName);
    $getSubFolderAttr = $getFolderAttr.SubFolders
    $getSubFolderAttr | select path, @{Name=”size(KB)”;Expression={“{0:N2}” -f($_.size/1KB)}} | ft -auto

  4. Pingback: ps and folder size « IT Info

  5. Anonymous says:

    I’ve have developed a few PS scripts which does the job but my only hurdle was SPEED, particularly when scanning a large directory (e.g. C:\Program Files, C:\Windows etc.) across a remote server. Well this script is not only accurate but damn FAST. Great job!

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    Is there a way to sum up the export of size?

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  17. whistling viking says:

    I am fairly new to powershell. Is there a way to modify #3 to show the total size of the root folder with all the other subfolders added in?

    ie. c:\windows = 2 GB
    instead of
    c:\windows\system32 = 1 GB
    c:\windows\syswow64= 750 MB
    c:\windows\inf= 250MB


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