DVR systems NVR38xx Series - Manual (Page 29)

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3.2 2U Series
① Unscrew the screws on the rear panel and cover the upper cover.
② Place the HDDs on the HDD bracket and fix the HDD on the bracket with four screws.
③ Use data cable to connect main board and HDD port, then connect the power (the other end) cable to the HDD
port.
④ After wires are connected, place the upper cover on the device and twist the screws on the rear panel.