If the DVR/NVR can't find the HDD . the reason maybe as below. 1. DVR/NVR not support connect& disconnect HDD when the power on . You must to power off , connect the HDD . Then Power ON 2. Check if the HDD already power on . if the SATA cable connect correct . Way : When power on . put hand on to the HDD to test it the HDD working(vibrate), if no vibrate . means the HDD no power in . Pls change the 1 cable to test it . Also change the SATA Cable to test it .
3. To check if the Power Adapter working or enough . if can works in 1TB . can't working 2TB or 3TB . change to 5A Power to test it . 4. Check if the HDD Broken or not . 5. Usually the DVR support WD (Westdigital brand) If use the other brand . It maybe not compatibility well 6. Default the DVR and upgrade it in new FW. 7. if all no working . Please contact our technician.