try {
      BufferedReader input = new BufferedReader(new FileReader("/sys/block/mmcblk1/device/cid"));
      String sd_cid = input.readLine();
      Log.i(TAG, "cid:");
      Log.i(TAG, sd_cid);
    } catch (Exception e) {
      Log.e(TAG, "Can not read SD-card cid");
    }