Sorry to tell you that the maximum capacity of HDD for each interface of our NVR is 6TB. If you use a hard disk larger than 6TB, there may be compatibility issues. We are very sorry for the inconvenience. We will feed your needs back to our production department to see if it can be improved in the future. For more information, please refer to: https://support.reolink.com/hc/en-us/articles/900004550003-How-Many-HDDs-Can-I-Connect-with-Reolink-NVR-System