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This User Manual covers SSD installation, formatting, connectivity, and troubleshooting for the Satechi USB4 Slim NVMe SSD Enclosure (ST-EU4SNSS). The USB4 Slim NVMe SSD Enclosure supports M.2 NVMe SSDs and connects via USB4 for speeds up to 40Gbps — compatible with USB4, Thunderbolt 3, Thunderbolt 4, and USB 3.2 Gen 2 hosts.

What's in the Box

• USB4 Slim NVMe SSD Enclosure (ST-EU4SNSS)
• USB4 connection cable
• Thermal tape
• Screwdriver
• Screws
• User Manual

SSD Installation

1. Rotate the enclosure's bottom cover clockwise to unlock it, then lift the cover to access the M.2 slot.
2. Before inserting the SSD, apply the included thermal tape to the SSD controller area as indicated in the diagram on the packaging.
3. Align the M.2 NVMe SSD with the slot and insert it at a 30-degree angle, then press down gently and secure with the included screw.
4. Replace the bottom cover and rotate counterclockwise to lock it.

The enclosure accepts M.2 NVMe SSDs (2230, 2242, 2260, 2280 form factors). SATA M.2 SSDs are not supported — NVMe only.

Connecting to Your Computer

1. Connect the included USB4 cable between the SSD Enclosure and a USB4 or Thunderbolt port on your computer.
2. The SSD will mount automatically on macOS if it is already formatted. On a new (unformatted) SSD, format it using Disk Utility (macOS) or Disk Management (Windows) before use.

Formatting a New SSD

• macOS: Open Disk Utility, select the SSD from the left sidebar, click Erase, choose APFS or Mac OS Extended, and click Erase.
• Windows: Open Disk Management, right-click the new disk, initialize it (MBR or GPT), then create a new Simple Volume with NTFS formatting.

Transfer Speeds

When connected to a USB4 or Thunderbolt 4 host, the USB4 Slim NVMe SSD Enclosure supports data transfer speeds up to 40Gbps — the full USB4 Gen 3×2 bandwidth. Actual speeds depend on the NVMe SSD installed and the host port capabilities.

Troubleshooting

• SSD not detected — Ensure the SSD is fully seated and the screw is tightened. Try a different USB4/Thunderbolt cable or port. A new SSD may need to be formatted before it appears in Finder or Explorer.
• Transfer speeds lower than expected — Confirm the host port is USB4 or Thunderbolt 3/4. USB 3.2 Gen 2 ports will cap transfer speed at 10Gbps. Use the included USB4 cable for best performance.
• SSD gets warm during use — Normal during heavy data transfer. Ensure the thermal tape is applied correctly. Do not cover the enclosure.

Specifications

• Model: ST-EU4SNSS
• Interface: USB4 Gen 3×2 (40Gbps)
• SSD Form Factor: M.2 NVMe (2230 / 2242 / 2260 / 2280)
• SATA Support: No (NVMe only)
• Connector: USB-C (USB4)
• Compatible Hosts: USB4, Thunderbolt 3, Thunderbolt 4, USB 3.2 Gen 2