Dupes mit anderem Dateinamen finden und in "HardLinks" umwandeln (W2k12R2, NTFS)

powershell.exe -File "C:\replace_duplicates_with_hardlinks.ps1" "D:\Datenpfad"

param(
    [parameter(mandatory=$true)][string]$dir
)

# function calculate MD5 hash of file object
function md5([System.IO.FileInfo]$fileobj){
    $md5 = [System.Security.Cryptography.MD5]::Create()
    Try{
        $stream = $fileobj.OpenRead()
        $hash = [System.BitConverter]::ToString($md5.ComputeHash($stream))
        $stream.Close();$stream.Dispose();$md5.Dispose()
        return $hash
    }catch{
        write-host "Error: $($_.Exception.Message)"  
        return $false
    }
}

# function to create new hardlink
function New-HardLink {
    param
    (
        [Parameter(Mandatory=$true)]$originalfile,
        [Parameter(Mandatory=$true)]$mirrorfile
    )
    $code = '  
            [DllImport("Kernel32.dll")]  
            public static extern bool CreateHardLink(string lpFileName,string lpExistingFileName,IntPtr lpSecurityAttributes);
    '  
    Add-Type -MemberDefinition $code -Name Links -Namespace Utils 
    [Utils.Links]::CreateHardLink($mirrorfile,$originalfile,[IntPtr]::Zero)
} 


$files = dir $dir -Recurse | ?{!$_.PSIscontainer}
$hashes = @()

# Create Hashes of files
write-host "Hashing der Dateien gestartet..."  
foreach($file in $files){
    $md5hash = md5 $file
    $hashes += new-object PSObject -Property @{"FileObject"=$file;"Hash"=$md5hash}  
}

# select equal hashes with count greater 1
$hashes | group Hash | ?{$_.Count -gt 1} | %{
    # select files with same LastWriteTime in Hashgroup
    $dupes = $_.Group.FileObject | group LastWriteTime | ?{$_.Count -gt 1} | select Group
    $dupes | %{
        $original = $_.Group | select -Expand Fullname -First 1
        $additional = $_.Group | select -Expand Fullname -Skip 1
        $additional | %{
            # delete duplicate
            remove-item $_ -Force
            write-host "Ersetze '$_' durch einen Hardlink auf '$original'" -ForegroundColor Cyan  
            # create hardlink for duplicate
            New-HardLink $original $_ | out-null
        }
    }
}