HIKVISION DS-7100NI-SL Quick Operation Manual page 4

Quick Operation Guide of Network Video Recorder
2. Place the HDD on the bottom of the device and then fasten the screws on the bottom to fix the HDD.
3. Connect one end of the data cable to the motherboard of NVR and the other end to the HDD.
4. Connect the power cable to the HDD.
5. Re-install the cover of the NVR and fasten screws.
3