The NVR-1820UD from Sony is a Preinstalled with Redundant Power Supply and 8 x 1TB HDD. Preconfigured for RAID 5 with 1 Spare HDD. 2U front door for NVR-1830U, NVR-1830UD, NVR-1820U, NVR-1820UD and NVR-J1830U.
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