zero

# fills the free space on disk with zeroes

$buf = [byte[]](1024 * 1024);
$path = "$CWD\zero";

$file = [IO.File]::Create($path, $buf.Length, [IO.FileOptions]::DeleteOnClose);

try {
    while(1) {
        $file.Write($buf, 0, $buf.Length);
    }
} catch {
}

$file.Flush();
$file.Close();