1. Introduction
The ORICO DD28U3-C is a versatile dual-bay hard drive docking station designed for both 2.5-inch and 3.5-inch SATA I/II/III HDDs and SSDs. It supports a total capacity of up to 40TB (2x20TB) and offers high-speed data transfer via USB 3.0 with UASP and Trim protocol support. This device also features a convenient offline clone function, allowing direct drive duplication without requiring a computer connection. Its tool-free design ensures easy installation and hot-swapping of drives, making it an efficient solution for data backup, recovery, and storage expansion.
2. Package Contents
Please verify that all items are present in the package:
- ORICO DD28U3-C Dual Bay HDD/SSD Docking Station
- USB-A to USB-B Cable
- Power Adapter (12V/3A)
- User Manual
Video: Unboxing and overview of the ORICO DD28U3-C Dual Bay Hard Drive Docking Station, showing the device and its included accessories.
3. Product Overview
The ORICO DD28U3-C docking station is designed for ease of use and high performance. Key features include:
- Dual Bay Design: Supports two 2.5-inch or 3.5-inch SATA I/II/III HDDs/SSDs simultaneously.
- Large Capacity: Compatible with drives up to 2x20TB, totaling 40TB.
- High-Speed Transfer: USB 3.0 interface provides data transfer speeds up to 5Gbps, enhanced by UASP and Trim protocols.
- Offline Clone Function: Duplicate drives directly without connecting to a computer.
- Tool-Free Installation: Easy plug-and-play setup for drives, no tools or drivers required.
- Auto-Sleep Mode: Automatically enters sleep mode after 10 minutes of inactivity to save energy and prolong drive lifespan.
- Dust-Proof Design: Unique cover plate design helps protect drive bays from dust.
- Silicone Anti-Skid Pad: Ensures stability and reduces vibration on your desktop.
- Broad Compatibility: Works with various devices including PCs, laptops, smart TVs, smart routers, PS4, and PS5. Supports Windows, Mac, Linux, iPad OS (Thunderbolt), and Android (OTG required for mobile phones).
- Safety Protections: Built-in safeguards against overcurrent, short circuit, overheat, static, and leakage.

Image: The ORICO DD28U3-C docking station showcasing its support for 40TB large capacity with 2.5-inch and 3.5-inch HDD/SSD compatibility. Seagate drive verification link

Image: Visual representation of the docking station's safety features and UASP/TRIM support for stable and secure data operations.

Image: Detailed view of the LED lights and their indications for power, data connection, and read/write activity.
4. Setup
Follow these steps to set up your ORICO DD28U3-C docking station:
- Unpack: Carefully remove the docking station and all accessories from the packaging.
- Insert Drives: Open the dust-proof covers and gently insert your 2.5-inch or 3.5-inch SATA HDDs/SSDs into the drive bays. Ensure they are seated firmly.
- Connect Power: Plug the provided 12V/3A power adapter into the DC port on the back of the docking station, then connect it to a power outlet.
- Connect to Computer (for PC Mode): If you intend to use the docking station with a computer, connect the USB 3.0 cable from the docking station's USB-B port to an available USB-A port on your computer.

Image: Connecting the power adapter and illustrating the dust-proof design of the drive bays.
5. Operating Instructions
5.1 PC Mode (Data Transfer & Storage Expansion)
Use this mode to connect your drives to a computer for data access, backup, or storage expansion.
- Ensure the docking station is powered on and connected to your computer via the USB 3.0 cable.
- Insert the desired HDD/SSD into either bay.
- The drives will be recognized by your operating system as removable storage. You can now access, transfer, and manage files as you would with any external drive.
- For new drives, you may need to initialize and format them using your operating system's disk management tools (e.g., Disk Management in Windows, Disk Utility in macOS) before they can be used.

Image: Illustrating high-speed data transfer in PC mode, showing the docking station connected to a computer.
5.2 Offline Clone Function
This function allows you to duplicate a hard drive without connecting the docking station to a computer.
- Disconnect from PC: Ensure the docking station is disconnected from your computer. The clone function operates independently.
- Insert Source Drive: Insert the drive containing the data you wish to copy (Source Drive) into the bay labeled 'Source' (typically the bottom or left bay).
- Insert Target Drive: Insert the blank or erasable drive where the data will be copied (Target Drive) into the bay labeled 'Target' (typically the top or right bay).
- Important Capacity Note: The Target Drive's capacity must be equal to or larger than the Source Drive's capacity. All data on the Target Drive will be overwritten during the cloning process.
- Initiate Clone: Press and hold the 'CLONE' button on the back of the docking station for approximately 3 seconds until the clone progress indicator lights (25%, 50%, 75%, 100%) begin to flash.
- Start Cloning: Briefly press the 'START' button to begin the cloning process. The progress indicators will light up sequentially as the cloning proceeds.
- Completion: Once all four progress indicators are solid, the cloning process is complete.
- Remove Drives: Safely remove the Source and Target drives from the docking station.

Image: Setup for offline clone mode, showing Source and Target drives and the capacity requirement.

Image: The switch for selecting between Clone and PC modes, highlighting their independent operation.
6. Maintenance
To ensure the longevity and optimal performance of your ORICO DD28U3-C docking station, please follow these maintenance guidelines:
- Keep Clean: Regularly wipe the exterior of the docking station with a soft, dry cloth to remove dust. Ensure the drive bays are free from debris.
- Avoid Liquids: Do not expose the device to water or other liquids. If liquid spills on the device, immediately disconnect power and allow it to dry completely before reuse.
- Temperature and Humidity: Store and operate the device in a cool, dry environment. Avoid extreme temperatures and high humidity, which can damage electronic components.
- Ventilation: Ensure the docking station has adequate ventilation to prevent overheating, especially during prolonged operation or cloning tasks.
- Handle with Care: Avoid dropping or subjecting the device to strong impacts.
7. Troubleshooting
If you encounter issues with your ORICO DD28U3-C, refer to the following common problems and solutions:
- Drive Not Recognized by Computer:
- Check if the power adapter is securely connected and the docking station is powered on.
- Ensure the USB 3.0 cable is firmly connected to both the docking station and your computer. Try a different USB port or cable.
- Verify that the HDD/SSD is correctly inserted into the bay.
- For new drives, they may need to be initialized and formatted in your operating system's Disk Management (Windows) or Disk Utility (macOS) before they appear.
- Restart your computer and try again.
- Offline Clone Function Not Working:
- Ensure the docking station is disconnected from the computer before attempting an offline clone.
- Verify that the Target drive's capacity is equal to or larger than the Source drive's capacity.
- Make sure both Source and Target drives are properly inserted into their respective bays.
- Press and hold the 'CLONE' button for approximately 3 seconds until the progress LEDs flash, then press the 'START' button.
- Slow Data Transfer Speeds:
- Confirm that you are using a USB 3.0 port on your computer and the provided USB 3.0 cable.
- Ensure your computer's USB controller supports UASP protocol for optimal performance.
- Check the health and performance of your hard drives.
- Avoid running multiple demanding applications during large file transfers.
- Docking Station Overheating:
- Ensure adequate ventilation around the docking station. Do not cover it.
- If using for extended periods, consider allowing it to cool down periodically.
8. Specifications
| Model | DD28U3-C |
| Brand | ORICO |
| Compatible Drives | 2.5-inch & 3.5-inch SATA I/II/III HDDs/SSDs |
| Max Capacity | 2 x 20TB (40TB Total) |
| Interface | USB 3.0 (5Gbps) |
| Protocols Supported | UASP, Trim |
| Power Adapter | 12V/3A |
| Material | ABS (Acrylonitrile Butadiene Styrene) |
| Compatible OS | Windows, Mac, Linux, iPad OS (Thunderbolt), Android (OTG required) |
| Dimensions | 24.5 x 13 x 8.1 cm |
| Weight | 560 g |
9. Warranty and Support
This ORICO product is covered by a standard manufacturer's warranty. For detailed warranty terms, technical assistance, or customer support, please refer to the official ORICO website or contact their customer service department directly. Keep your purchase receipt for warranty claims.





