New-SparseFile.ps1

function New-SparseFile
{
param(
    [string]$filepath, 
    [long]$sizeInBytes,
    [switch]$passthrough
) 
    if (test-path $filepath)
    {
        throw "File '$filepath' already exists."
    }
    else
    {
        try 
        { 
            $fs = new-object System.IO.FileStream $filepath, Create, ReadWrite 
            $fs.SetLength($sizeInBytes) 
        }
        catch {}
        finally
        {
            $fs.Close()
        }
        if ($passthrough)
        {
            write-output $( get-item $filepath )
        }
    }
} 


function New-PlaceholderFile
{
param(
    [int32]$Count,
    [string]$Path = $pwd
)
    $FileNamePrefix = '\Placeholder_'
    $FileExtension  = '.file'
    $sizeInBytes = 5GB
    
    $CountOffset = 0
    1..$count | ForEach-Object {
        
        while ($filepath -eq $null)
        {
            $Padding = 3
            do
            {
                $FileNumber = $( $_ + $CountOffset ).ToString()
                if ($count.tostring().length -gt $Padding) 
                { 
                    $FileNumberPadded = $FileNumber.padleft( $($count.tostring().length), '0')
                } 
                else 
                { 
                    $FileNumberPadded = $FileNumber.padleft($Padding,'0') 
                }
                $filename = $FileNamePrefix + $FileNumberPadded + $FileExtension
                $filepath = Join-path $path $filename
                
                if (test-path $filepath)
                {
                    $filepath = $null
                    $CountOffset++
                }
                
            } while (!$filepath)
        }
        
        $Message = "Create new sparce file '$FilePath'"
        Write-Debug $Message
        New-SparseFile -filepath $filepath -sizeInBytes $sizeInBytes -passthrough
        $filepath = $null
    }
    
}


#New-SparseFile -FilePath '.\test4.plc' -sizeInBytes 5GB 5 -passthrough
#New-PlaceholderFile -count 15 -path 'D:'