The ZR08JP originally launched supporting 4TB HDDs. However, modern surveillance drives (WD Purple, Seagate SkyHawk) now come in 6TB and 8TB sizes. The top firmware updates the disk addressing system, allowing the DVR to recognize larger storage capacities.
First, go to the ( supports.zositech.com ). From there, look for the Firmware Downloads section for NVRs. zosi zr08jp firmware download top
Go to Main Menu > Information > System on your NVR. The ZR08JP originally launched supporting 4TB HDDs