Computers / Storage
User Manual for OWC Express 1M2 External Storage Enclosure
Quick guide for the OWC Express 1M2 external storage enclosure. Learn how to install NVMe M.2 SSDs, connect to your device, format the drive, and manage performance settings.
Quick answers from the manual
Quick answer
- The OWC Express 1M2 is a high-performance external storage enclosure for NVMe M.2 SSDs. It supports USB4/Thunderbolt connectivity and requires formatting for non-Mac operating systems. p. 1, 2, 4
Key actions
- Install SSD p. 5, 6, 7, 8
- Connect to Host p. 3, 4
First start
- Connect the device to your host. If on Mac, it is pre-formatted APFS. If on Windows/other, reformat the drive using the OS disk management tools. p. 4, 12
Problems and fixes
Slow read/write speeds
Change Windows disk removal policy to 'Better performance'.
p. 12, 14
Connection issues
Verify cable connection or try a different cable/host.
p. 13, 14Technical specifications
| Parameter | Value | Meaning | Pages |
|---|---|---|---|
| Supported SSDs | NVMe M.2 (2280, 2242, 2230) | Compatible form factors for the internal drive. | p. 2 |
| Interface | USB4 40Gb/s | Data transfer speed and connection type. | p. 2, 3 |
Where to find it in the PDF
- System Requirements p. 1, 2
- Assembly Steps p. 4, 5, 6, 7
- Device Management p. 12, 13
Table of contents
Manual images
Click an image to enlargeQuick guide from the manual
The OWC Express 1M2 is a high-performance external storage enclosure designed for NVMe M.2 SSDs. It supports USB4 and Thunderbolt connectivity. The device comes pre-formatted as APFS for Mac systems, allowing for plug-and-play use. Users on Windows, ChromeOS, or Android will need to reformat the drive using their operating system's disk management tools to begin use.
Package Contents
- OWC Express 1M2 enclosure
- 0.3M (12") USB4 cable
- Screwdriver
- Getting Started QR Insert Card
Device Overview
LED Indicator: Solid White indicates power and data connection; Blinking White indicates data activity.
USB4 40Gb/s Port: Used to attach the included data cable to your host device.
Cable Stabilizer Mounts: Supports OWC ClingOn (sold separately) to secure cables.
Assembly Steps
Opening the Enclosure
- Place the enclosure upside down on a flat, static-free surface.
- Remove the two exposed case screws using the included screwdriver.
- Push the bottom tray away from the rubber foot to separate it from the top cover.
Installing an SSD
- The drive post is pre-installed for a 2280 NVMe M.2 SSD. If using a 2242 or 2230 form factor, loosen the drive post with a 5mm hex socket (not included) and move it to the corresponding position.
- Align the drive at a slight angle into the board connection and slide it forward until fully seated.
- Use the included drive screw to secure the SSD.
Closing the Enclosure
- Align the bottom tray and top cover so the thermal pad rests over the NVMe M.2 SSD.
- Slide the pieces together and press down on the top cover to ensure a strong bond.
- Secure the cover using the two case screws removed earlier.
- Peel the back of the rubber foot to expose the adhesive and press it into the notch housing the case screws.
Device Management
Disk Performance: On Windows 10 (v. 1809 or later), the default removal policy is 'Quick removal'. If experiencing slow speeds, consider changing this to 'Better performance' via Windows settings or the OWC Disk Performance application.
Unmounting: Always eject or unmount the volume from your operating system before disconnecting the device to prevent data loss.
Usage Notes
- Opening a pre-built OWC Express 1M2 (with factory-installed SSD) voids the warranty.
- NVMe SSDs with heat sinks are not supported.
- Thunderbolt 3 ports will limit performance to 10Gb/s.
- Not compatible with the front USB-C or USB-A ports of a Sony Playstation 5.
Safety Precautions
- Do not expose the device to temperatures outside the operating range (5°C – 35°C / 41°F – 95°F).
- Do not block ventilation openings.
- Use anti-static precautions when installing drives.
- Do not disassemble or modify the device.
- Keep away from water and damp conditions.
Practical help
Common problems
Slow read/write speeds on Windows
Check the Windows disk removal policy. Change it from 'Quick removal' to 'Better performance' manually or using the OWC Disk Performance app.
Device not recognized or connection issues
Verify the USB4 cable is securely connected. Try using a different USB4 cable or connecting to a different host device.
Before use
- Ensure you have a compatible NVMe M.2 SSD (2280, 2242, or 2230 form factor).
- Check that your host device supports USB4 or Thunderbolt (USB-C).
- If using Windows, ChromeOS, or Android, be prepared to reformat the drive.
- Ensure the SSD does not have a pre-installed heat sink, as it will not fit.
Specs in practice
- USB4 40Gb/s Port
- High-speed data transfer interface for connecting to the host.
- LED Indicator
- Solid White: Power/Connection; Blinking White: Data Activity.
Images and diagrams
- LED Indicator: Located on the front panel.
- USB4 Port: Located on the back panel.
Model compatibility
- Works with Mac (macOS 10.13+), PC (Windows 10+), iPad, iPhone, ChromeOS, and Android.
- Thunderbolt 3 ports will limit performance to 10Gb/s.
- Not compatible with the front USB-C or USB-A ports of a Sony Playstation 5.
Manual page author
Michael Turner
Technical manual editor
Reviews PDF manuals for structure, safety notes, and practical product details so readers can find the right information quickly.