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With latest chromedriver.exe running into out of disk space issues as chromedriver is not deleting the folder named scoped_* at the end of the execution. It is occupying almost 20 GB of space for 400 tests. I tried with both 2.28 and 2.29 versions of chromedriver. I am exiting the driver properly with driver.close() and driver.Quit() too. Chrome browser version is 57.

Answers

I managed this by adding deletion of temp folders that begins with "scoped_dir" after quitting driver like:

 public static void teardown_()
        {
            // quit driver
            if (driver != null)
                driver.Quit();

            // delete all "scoped_dir" temp folders 
            string tempfolder = System.IO.Path.GetTempPath();
            string[] tempfiles = Directory.GetDirectories(tempfolder, "scoped_dir*", SearchOption.AllDirectories);
            foreach (string tempfile in tempfiles)
            {
                try
                {
                    System.IO.DirectoryInfo directory = new System.IO.DirectoryInfo(tempfolder);
                    foreach (System.IO.DirectoryInfo subDirectory in directory.GetDirectories()) subDirectory.Delete(true);
                }
                catch (Exception ex)
                {
                    writeEx("File '" + tempfile + "' could not be deleted:\r\n" +
                            "Exception: " + ex.Message + ".");
                }
            }
        } 

Hope it helps!