OWC 'Express 4M2' External Storage Enclosure for 4 NVMe M.2 SSDs

The Power of Choice is Yours. Engineered to support any NVMe M.2 2230, 2242, or 2280 SSD, this compact powerhouse gives you the ultimate flexibility to choose the drive you want today — including OWC Aura SSDs with up to a massive 8TB capacity each. When tomorrow’s 16TB and larger drives hit the scene, you can easily boost your Express 4M2’s capacity.

One Cool RAID for Diverse Workflows. High speed backups, multiple media card offloads, and intense RAW photo and 8K video editing sessions mean one thing… Heat. You can put aside any thermal throttling and noise concerns because the Express 4M2 utilizes a heat dissipating solid aluminum body along with smart, adaptive fans that activate only when needed or under heavy load. Diversity of use also means being able to easily work cross-platform with Macs and PCs. We help you keep your cool in mixed environments with our MacDrive software (avaialble separately).

The Best DIY RAID You Wanted. We heard you loud and clear (pun intended) when you said you loved everything about the Express 4M2 but wanted it quieter. After adding smart adaptive fans that only turn on when needed for near silent operation, we decided to give it USB4 connectivity for the optimum blend of compatibility, performance, and affordability. Now you can build a desktop/shuttle high-performance RAID with your choice of NVMe M.2 SSDs and get up to 3200MB/s performance with USB4, Thunderbolt, and USB-C Macs and PCs.

Highly Capable. Up to 3200MB/s real-world performance1,2

Highly Compatible. Use with USB4, Thunderbolt, and USB-C Macs and PCs

Highly Reliable. Aircraft grade aluminum offers rugged protection of installed SSDs plus effective heat dissipation to keep everything cool for consistent top speed

Near Silent Operation. Engineered with smart, adaptive fans that activate only when needed or under heavy load, making it ideal for uninterrupted creative focus

DIY Easy. Use your choice of NVMe M.2 2230, 2242, or 2280 SSDs

RAID Ready. Certain models include OWC SoftRAID; the fastest and most flexible RAID 0/1/4/5/1+0 (10) tool. Also supports Apple Disk Utility RAID, Windows Disk Management RAID, and Windows Storage Spaces.

Complete. Includes USB-C 40Gb/s cable

Stable. Included stand ensures maximum desktop placement stability

Worry-Free. 2 Year OWC Limited Warranty

Notes:

1. Drives not included. Performance results will vary depending on user installed drive. 3200MB/s performance based on testing a Software RAID 0 4x2TB OWC Aura Pro IV equipped Express 4M2 connected to a MacBook Pro (16-inch, 2021) running AJA System Test (4K-Full resolution, 64GB file size, 16bit RGBA codec, single file test).
   • Single drive performance up to 1600MB/s.
   • Intel Mac system users connected over Thunderbolt 3 will experience Write Speeds up to 1000MB/s and Read Speeds up to 2500MB/s.
2. For best performance, the USB mode switch should be kept in the factory USB4 40Gb/s setting when connecting the Express 4M2 to the following systems:
   • Mac: Thunderbolt 5, Thunderbolt 4, USB4, or Thunderbolt 3 Intel based systems running macOS 15.x and later.
   • Windows: Thunderbolt 5, Thunderbolt 4, and USB4 systems.
3. To ensure compatible performance, the USB3.2 10Gb/s mode should be selected when connecting the Express 4M2 to the following systems:
   • Mac: Thunderbolt 3 Intel based systems running macOS 14.x or earlier.
   • Windows: Thunderbolt 3 and USB 3.2 10Gb/s systems.