OWC Express 4M2 NVMe RAID Enclosure


  • Four NVMe M.2 SSD slots
  • Compact design
  • Includes SoftRAID XT: robust software for creating, monitoring, and managing advanced RAID sets
  • Thunderbolt Certified for Mac and Windows
  • Thunderbolt cable included
  • 1 Year OWC Limited Warranty
OWC Express 4M2 NVMe RAID Enclosure Product Image
OWC Express 4M2 NVMe RAID Enclosure $339.99

Free shipping on most orders over $149


  • Ships from Canada
  • For Vancouver area pickup call (604) 719-6754
  • Most orders ship within 24 hours
  • View our Return Policy
OWC logo image with link to OWC products
SKU: 02030201

OWC Express 4M2 NVMe RAID DIY Enclosure with SoftRAID XT

Pint-Sized Powerhouse

Small in stature. Big on capability. The OWC Express 4M2 is ready to serve with four easy-to-access NVMe M.2 SSD slots customizable for any workflow with vibration damping feet that allow for vertical or horizontal orientation. Install up to 32TB of capacity and experience up to 2800MB/s of mind-bending performance via Thunderbolt 3. The Express 4M2 is an amazingly small digital workhorse with world-renowned OWC quality and award-winning support built in.

Built Smaller and Faster from Input by Pros Like You.

The OWC Express 4M2 is designed with superior ease-of use in mind. We worked with award-winning creatives and listened to the kudos they heaped onto the OWC ThunderBay mini, and we put all that shared knowledge to good use when we set out to build the next-gen Thunderbolt 3 multi-bay drive. The result is the 57% smaller and 2.5x faster OWC Express 4M2.
It’s smaller and easier to fit into your workflow, studio and on stage. It’s faster with four easy-access M.2 slots so you can swap, upgrade or expand your Express 4M2 to configure and reconfigure it to serve any project need.

Game-Changing NVMe SSD Performance

NVMe (Non-Volatile Memory Express) is a hyper-efficient communications interface protocol built from the ground up to properly take advantage of SSD technology and high-performance connection buses like PCIe. The result is exponentially faster and efficient SSD storage, and the OWC Express 4M2 has room for four NVMe SSDs.

Easy and Complete Drive Management with SoftRAID XT

SoftRAID XT is the most powerful, intuitive RAID management software on the market for macOS and Windows. SoftRAID’s RAID creation and management technology has been finely tuned to perfection with over 20 years of development to provide rock solid protection of your data and optimize drive performance. It is packed with features like multiple RAID options, validation and verification of drives, and predictive disk failure with SoftRAID Monitor. SoftRAID provides a level of performance that you simply can’t get with hardware RAID.


Create advanced RAID 0/1/4/5/1+0 (10)1volumes for higher performance and/or redundancy.2


More accurate than SMART, SoftRAID protects your data by alerting you to issues before anything happens, providing peace of mind and giving you more time to address issues. Solutions that rely exclusively on SMART data can be seeing performance loss or corruption before flagging an issue.


Built-in MacDrive technology lets you read/write SoftRAID RAID 0/1 arrays and use them interchangeably between Windows and macOS.


With SoftRAID you’re not locked to expensive hardware. SoftRAID is upgradable and portable.


New license management enables quick activation or deactivation so your license can move moved between computers.


Works with macOS 10.12 or later (including Big Sur), M1 Macs, and Windows 10.3

SoftRAID is ideal for anyone who needs to safely store and backup massive amounts of data, including video editors, audio producers, photographers and graphic designers.

Multi-Drive Flexibility

Configure and reconfigure your storage however you need by combining multiple OWC Express 4M2 drives together on Mac and Windows. With OWC SoftRAID (included with Express 4M2) you get the amazing capability to RAID across multiple drive enclosures. On a Windows PC, add more Express 4M2 drives to your storage pool using Windows Storage Spaces.


Display connection flexibility is yours with a convenient DisplayPort located right on the rear of the OWC Express 4M2. There’s no need to worry about adapters or extra long cables. Just plug your display directly into the Express 4M2 and you’re all set.




Number of Bays

  • 4

Drive Bays

  • 4 bays supporting: M.2 drives
  • Supports NVMe M.2 SSDs with 2280 form factor and “M Key” connector type. Single- and double-sided SSDs are supported.
  • Each bay offers PCIe 3.0 x1 performance

Mechanisms Supported

  • NVMe M.2 SSD (2280 Form Factor, M-key, Single or Double Sided)

Hot Plug Support

  • Yes

Boot Support

  • All four drive bays are bootable on macOS. SSDs with 512 byte sectors require macOS 10.13 or later.

RAID Capable

  • Yes

RAID Features

  • Software RAID

Power Delivery

  • Two Thunderbolt 3 ports with 15W power delivery each.

Device Ports

  • (1) Host Port – Thunderbolt 3 (USB-C) up to 40 Gb/s (5000 MB/s)
  • (1) Thunderbolt 3 (USB-C) Port
  • (1) DisplayPort Port

Display Support

  • Up to one 4K display @ 60Hz,
  • or one 4K display @ 30Hz,
  • or two 4K displays @ 60Hz

Display Support by Port

  • DisplayPort 1.2: Up to 4K @ 60Hz

Data Transfer Rate (Maximum)

  • Thunderbolt 3 : Up to 40 Gb/s (or 5000 MB/s)


  • (1) Thunderbolt 3 – Alpine Ridge DSL6540

MTBF (Mean Time Between Failures)

  • Varies depending on drive mechanism installed

Contact Start Stops

  • Varies depending on drive mechanism installed

Host Port Requirements

  • Thunderbolt (USB-C) port (backward compatible with Thunderbolt 2/Thunderbolt1)

Mac OS Compatibility

  • macOS 10.12 Sierra
  • macOS 10.13 High Sierra
  • macOS 10.14 Mojave
  • macOS 10.15 Catalina
  • macOS 11.x Big Sur
  • macOS 12.x Monterey
  • macOS 13.x Ventura

PC OS Compatibility

  • Windows 11
  • Windows 10 32-bit Edition
  • Windows 10 64-bit Edition
  • Windows Server 2016

Driver Required

  • No

Other Requirements

  • When using Express 4M2 with Mac Studio (M2 Max or M2 Ultra) or Mac Pro (M2 Ultra), some drives may require macOS 13.5 or later for proper operation.
  • When using one or more SSDs with 512 byte sectors, macOS 10.13 or later is required.

External Power Adapter

  • Yes

Power Supply

AC Input

  • 100-240V, 50-60Hz, 1-2A

DC Output

  • +12V, 6A


  • 72W

Replacement Adapter Part Number


  • (1) 60mm 2,800RPM cooling fan

Security Slot

  • No

Power/Activity LED

  • Yes

Housing Color

  • Black

Housing Material

  • Aluminum


  • Height: 6.0 cm (2.4 in)
  • Length: 11.3 cm (4.4 in)
  • Width: 13.6 cm (5.4 in)


  • 800.0 g (1.76 lbs)


  • CE
  • FCC

Ambient Temperature

  • Operating: 32°F to 104°F (0°C to 40°C)
  • Non-Operating: -4°F to 158°F (-20°C to 70°C)


  • Operating: -304.8 m to 3,048.0 m (-1,000 ft to 10,000 ft)
  • Non-Operating: -304.8 m to 12,192.0 m (-1,000 ft to 40,000 ft)
  1. Thunderbolt 2/Thunderbolt compatibility requires a certified

What's Included

(1) OWC Express 4M2 External Storage Enclosure
(1) 0.7M Thunderbolt Cable
(1) Power Supply and Power Cable
(1) Quick Start Guide for OWC Express 4M2
(1) Assembly Manual & User Guide for OWC Express 4M2
1 Year OWC Limited Warranty


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