User Manual for OWC Gemini 1GbE Storage and Dock

Quick guide from the manual

The OWC Gemini 1GbE is a dual-drive storage enclosure and dock. Before using the device, ensure your system meets the requirements: macOS 10.14 or later, or Windows 10 or later. The device supports 3.5"/2.5" SATA HDDs/SSDs and SD 4.0 cards. Always eject or unmount the device from your operating system before disconnecting it to prevent data loss.

Device Overview

The front of the device features status LEDs for Drive A and Drive B, a Power LED, and an SD Media Slot. The rear panel includes USB 3.1 Gen 1 ports, an Ethernet port, a Kensington Security slot, a RAID selector dial, a DC IN power port, a DisplayPort, and two Thunderbolt 3 ports.

Assembly Steps

If you purchased the OWC Gemini as a bare enclosure, follow these steps to install drives:

1. Place the device on a static-free surface.
2. Remove the two screws from the back of the enclosure and store them.
3. Pull the front edge of the enclosure to slide out the inner chassis.
4. Set the inner chassis flat on your work surface.
5. Place a 2.5-inch or 3.5-inch SATA drive into the housing with the label facing upwards.
6. Affix the drive to the inner chassis using the appropriate screws (one screw for 2.5" drives, eight screws for 3.5" drives).
7. Slide the inner chassis back into the outer enclosure and secure it with the screws removed in step 1.

Hardware RAID Settings

The OWC Gemini supports multiple RAID modes, which must be selected before powering on the device:

• RAID 0 (Drive Striping): Combines capacities for speed. No data redundancy.
• RAID 1 (Drive Mirroring): Copies data to both drives for redundancy.
• Span: Combines capacities sequentially. No performance or redundancy benefits.
• Independent Drive Mode: Drives appear as separate disks.

To change the mode, use a paper-clip or flat-head screwdriver to rotate the RAID dial on the rear panel until the arrow aligns with the desired mode. The setting takes effect after powering on the device.

Device Management

If a drive fails, the corresponding front LED will light up solid red. For RAID 1, you can replace the failed drive to rebuild the array. For RAID 0, Span, or Independent modes, data on the failed drive is typically lost. Always replace failed drives with identical models (capacity, firmware) to ensure compatibility.

Troubleshooting

If you experience issues:

• Verify the power cable is connected and the power strip is on.
• Ensure the data cable is properly connected to both the computer and the Gemini.
• Try a different Thunderbolt 3 cable.
• If the rebuild LED is pulsing, wait for the process to complete (up to 48 hours).
• For slow read/write speeds on Windows, check the Disk Removal Policy and change it from 'Quick removal' to 'Better performance'.