@reolink-fiona Thank you for your response. Unfortunately, I wasn't clear as to what I was asking. I am accustomed to using RAID systems and other configurations with multiple hard drives. In many circumstances, the drive that can be added has to match the size of the existing drive. That is the essence of my question. Is the multiple drive configuration used for the NVR a JBOD format, or some form of RAID format? Can I add any size drive up to 6TB?

We are in the process of installing an RLK16-800B8 system with an additional RLC-823A thrown in for good measure. I understand that I can add a second hard drive to the 4TB that is already installed in the NVR. My question is, am I limited as to what I can add by the size of the existing (4TB) drive? Can I add a 6TB drive to the system and wind up with a total capacity of 10TB?

I have downloaded the update file for my NVR. It downloads as a .zip file. When I decompress it, I get a .PAK file. Does that file have to be decompressed? I'm confused by the instructions as they say to unpack the PAK file. Has that already occurred in unzipping the download?