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void hddName(String ip) {

  try {
         String commands="cmd /c wmic.exe DISKDRIVE  get name";//HDD Details
         //System.out.println({"CMD", "/C", "WMIC OS GET Installdate,SerialNumber"});
         Process process = Runtime.getRuntime().exec(commands);
         process.getOutputStream().close(); //Closing output stream of the process
         System.out.println();
         StringBuilder sb=new StringBuilder();
        //Reading sucessful output of the command
        BufferedReader reader = new BufferedReader(new InputStreamReader(process.getInputStream()));
    while ((s = reader.readLine()) != null)
    {
        sb.append(s).toString();//append output
    }
        System.out.println("result"+sb);//gives result with null keyword
        String ss=sb.toString();//gives result with null keyword
        System.out.println("result"+ss);
        try{
                System.out.println(s);
                Connection conn;
                Statement stmt;
                Class.forName("com.mysql.jdbc.Driver");
                conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/system","root","");
                stmt= conn.createStatement();
                String sql="update sys set hdname='"+ss+"' where ip='"+ip+"'";// save null to mysql database
                int val= stmt.executeUpdate(sql);
                conn.close();
                stmt.close();
            }
            catch(Exception e)
            {

            }
    // Reading error if any
    reader = new BufferedReader(new InputStreamReader(process.getErrorStream()));
    while ((s = reader.readLine()) != null)
    {
     System.out.println(s);//any error
    }
   }
  catch (IOException e)
 {
   e.printStackTrace(); //TODO: necessary exception handling
  }
  // return s;
 }