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D-Link DNS-3±1 User Manual
Section 1 - Product Overview
Hardware Overview
Front View
Power Button: 
Press once to power on the DNS-321. Press and hold the button until it begins to blink to power down the DNS-321.
Drive Light:
These lights will be solid BLUE when drives are connected but inactive. The lights will blink when the drives are being 
accessed, formatted or synchronized. They will illuminate AMBER if a drive has failed.
Network Activity Light:
The light will be solid BLUE when there is an Ethernet connection. It will blink to indicate LAN traffic.
Power Button
Drive Light
Drive Light
Network Activity Light
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D-Link DNS-3±1 User Manual
Section 1 - Product Overview
Power Receptacle:
The supplied power adapter connects here.
Ethernet Port:
A Gigabit Ethernet port that connects the DNS-321 to a network.
Drive Eject Lever:
Use the provided levers to eject the hard drives. The front panel must be removed before ejecting the drives.
Reset Button:
A pinhole button located beside the Ethernet socket is used to reset the system or restore the factory default settings
.
Note: 
After
resetting the unit you will still be able to access the data on your hard drives.
Rear Panel (Connections)
Ethernet Port
Power Receptacle
Drive Eject Lever
Drive Eject Lever
Reset Button
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D-Link DNS-3±1 User Manual
Section ± - Installation
Installation
1. Slide the faceplate up until it unlatches from the device.
2. Once the faceplate is unlatched, pull it off the device, exposing 
the drive bays.
This section provides installation information for the DNS-321. To install the DNS-321 on your local network, refer to 
the steps below:
Hardware Setup
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D-Link DNS-3±1 User Manual
Section ± - Installation
3. Insert a 3.5” SATA hard drive into an available drive 
bay. Make sure to align the drive connector to the SATA 
connector on the bottom edge inside the drive bay of the 
DNS-321. Gently push the drive in until it connects. When 
a drive is inserted properly, you will feel it “seat” into the 
connector. Some hard drives that are thin or oddly shaped 
may need to be guided carefully into position. 
If a drive 
is not properly seated, the light will not illuminate after 
powering on the device.
4. 
Attach the faceplate to the front of the device.
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D-Link DNS-3±1 User Manual
Section ± - Installation
5. Connect an Ethernet cable to the available Ethernet port. This 
cable should connect the DNS-321 to your local network via a 
router or switch, or directly to a computer for configuration.
6. Connect the power adapter to the power receptacle.
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