Windows Troubleshooting

• https://www.reddit.com/r/PowerShell/comments/66nsr9/treesize_script/

function getSubFolderSizes    
{
    param(
        [string]$targetFolder,
        [Int64]$minSize = 1GB,
        [Int64]$parentSize,
        [String]$indent = " ",
        [Int]$depth = 1
    )        

    if ($depth -le 3){ #depths greater than this threshold cause the function to return $null, signaling that the higher level folder should be used

        # Get a list of Sub-directories in the current targetFolder
        $colItems =  Get-ChildItem $targetFolder -Directory -ErrorAction SilentlyContinue | Where-Object{$_.FullName.Substring(0,1) -eq $targetFolder.Substring(0,1)} 

        # Check each sub-folder
        foreach ($i in $colItems){

            # Measure the size of all Files in this subfolder        
            Get-ChildItem -Depth 1000 -LiteralPath $i.FullName -File -Force -Recurse -ErrorAction SilentlyContinue | Measure-Object -property length -sum -ErrorAction SilentlyContinue | 
                Where-Object {$_.Sum -ge $minSize} |
                ForEach-Object {
                    # This subfolder's size is above threshold

                    # Add it to our output
                    ("{0,15}{1,7}{2,-1}" -f ("{0:N2}" -f ($_.sum / 1GB) + " GB"), ("{0:P0}" -f ($_.sum / ($lowestVolume.Size - $lowestVolume.SizeRemaining)) + "  "), ($indent + $i.FullName))

                    #And dig deeper
                    getSubFolderSizes $i.FullName $minSize $_.sum (" " + $indent) ($depth+1)
                }            
        }
    }
}


$minFolderSize = 1GB
$lowestVolume = Get-Volume C
getSubFolderSizes ($lowestVolume.DriveLetter+":\") $minFolderSize ($lowestVolume.Size - $lowestVolume.SizeRemaining)

and performant

param(    
    [String]$Path,
    [Int]$Count = 10,
    [Int64]$MinSize = 1GB
)

$tempOutput = New-Object PSObject -Property @{Length=0; Path=$null}

Get-ChildItem -Depth 1000 -LiteralPath $path -File -Force -Recurse -ErrorAction SilentlyContinue | Select-Object Directory, Length |
ForEach-Object{
    if ($_.Directory.FullName -eq $tempOutput.Path){
        $tempOutput.Length += $_.Length
    } else {
        if ($tempOutput.Length -ge $minSize){
            $tempOutput | select Path, @{Name="Size (GB)"; Expression={"{0:N2}" -f ($_.Length / 1GB)}}
        }

        $tempOutput.Length = 0
        $tempOutput.Path = $_.Directory.FullName
    }
} |
Sort-Object "Size (GB)" -Descending | Select-Object -First $Count