Error 734 may mean different things in different internet connection platforms. But if you have got tata photon plus connection, (Tata docomo) and when you are trying to connect the drive to computer, if you are getting this error message, then it simply means that your prepaid tariff plan has ended and you need to recharge.
Before going for the recharge, just refresh and retry connecting it. If that fails, then call the customer care number to confirm with this issue. – 1800 266 121 (toll free).