OWC Express 4M2
OWC Express 4M2
Four-Slot USB4 NVMe M.2 SSD RAID Enclosure with Up to 3200MB/s Performance (SoftRAID not included).
The OWC Express 4M2 stands out for its USB4 connectivity and support for four NVMe M.2 SSDs in RAID configurations.
It delivers real-world speeds up to 3200MB/s on compatible ports, with smart adaptive fans ensuring cool, near-silent operation even under heavy loads like 8K video editing.
Compatible with macOS and Windows, it’s the flexible DIY RAID solution pros need for high-speed backups and media workflows.
- Aircraft-grade aluminum chassis for rugged protection and heat dissipation.
- Supports 2230, 2242, 2280 M.2 SSDs up to 8TB each for 32TB total capacity.
- Software RAID 0/1/4/5/10 via OWC SoftRAID or native tools.
- Includes USB-C 40Gbps cable and stable stand for desktop use.
- SoftRAID not included
£ 207.95 | £ 249.54 inc VAT
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Category: Desktop Hard Drives & RAIDs
Brand: OWC
OWC Express 4M2 Product Overview
The OWC Express 4M2 is a compact, four-slot enclosure for NVMe M.2 SSDs, enabling users to build custom high-performance RAID arrays with USB4 (40Gbps) connectivity for speeds up to 3200MB/s.
From my three decades in data storage, it's a game-changer for creative pros handling massive RAW photo libraries, 8K video timelines, or multi-card offloads, offering flexibility without thermal throttling or noise distractions.
DIY Drive Flexibility
Install any combination of NVMe M.2 2230, 2242, or 2280 SSDs, scaling from single drives to full RAID sets up to 32TB total capacity.
Upgrade easily as larger drives like 16TB options emerge, keeping your setup future-proof.
RAID Versatility
Supports RAID 0, 1, 4, 5, 10, and JBOD via OWC SoftRAID, Apple Disk Utility, or Windows tools—no hardware RAID controller needed.
Ideal for speed-focused RAID 0 striping or mirrored RAID 1 redundancy in demanding workflows.
Cross-Platform Compatibility
Works seamlessly with USB4, Thunderbolt 3/4/5, and USB-C on Macs (macOS 14+) and PCs (Windows 10+), falling back to USB 3.2 Gen 2 at 990MB/s where needed.
Optional MacDrive software aids mixed environments.
Thermal Management
Aircraft-grade aluminum dissipates heat effectively, paired with smart fans that spin up only under load for near-silent operation.
Perfect for PCIe Gen 5 SSDs that run hot during sustained transfers.
Compact and Stable Design
Dimensions allow vertical or horizontal placement with vibration-damping feet and included stand for desktop stability.
Weighs just 1.8kg, making it shuttle-friendly for field-to-edit workflows.
OWC Express 4M2 Key Features
- Four bays for NVMe M.2 2230/2242/2280 SSDs, supporting up to 32TB total capacity.
- USB4 (40Gbps) via USB-C port for up to 3200MB/s real-world speeds on compatible hosts.
- Software RAID 0/1/4/5/10/JBOD with OWC SoftRAID or native OS tools.
- Aircraft-grade aluminum chassis for durability, heat dissipation, and protection.
- Smart adaptive fans activate only under load for near-silent operation.
- Highly compatible with macOS 14+, Windows 10+, Thunderbolt 3/4/5, and USB 3.2 fallback.
- Compact design (17.8 x 13.9 x 6.0 cm) with vibration-damping feet and stable stand.
- Includes USB-C 40Gbps cable; external 48W-72W power supply.
- No drivers required; bootable on supported OS versions.
- 2-year OWC limited warranty.
OWC Express 4M2 Technical Specifications
| Chipset / Controller | USB4: Asmedia ASM-2464PDX |
| Dimensions | Height: 13.9 cm (5.5 in), Length: 17.8 cm (7.0 in), Width: 6.0 cm (2.4 in) |
| Weight | 1.8 kg (3.97 lbs) |
| Drive Bays | Four bays supporting M.2 “M-Key” NVMe SSDs (2230, 2242, 2280) |
| RAID Levels Supported | RAID 0, 1, 4, 5, 10, JBOD (Software RAID) |
| Data Transfer Rate (Real-World) | Up to 3200MB/s (USB4/Thunderbolt); 990MB/s (USB 3.2 Gen 2) |
| Ports | 1x USB-C (USB4 40Gbps, Thunderbolt 3/4/5 compatible, USB 3.2 Gen 2 fallback) |
| Compatibility | macOS 14+, Windows 10+; Apple Silicon M1/M2/M3/M4, Intel Macs, PCs |
| Driver Required | No |
| Power Supply | Input: 100-240V 50-60Hz 1.5A; Output: 12V 4A-6A; Consumption: 48W-72W (external brick) |
| Cooling | Aircraft-grade aluminum chassis + smart adaptive fans |
| Included Accessories | USB-C 40Gbps cable, stable stand, vibration-damping feet |
| Operating Temperature | 5°C to 35°C (41°F to 95°F) |
| Warranty | 2-Year OWC Limited Warranty |
OWC Express 4M2 Product Videos
OWC Delivery Information
Generally, next working day delivery services (UK Mainland) are available on standard OWC Delivery orders placed before 2 pm (subject to stock availability).
Non-timed deliveries should be delivered between 9 am and 6 pm.
Orders placed after 2 pm on Fridays and weekends will be processed as normal the following Monday.
Orders placed on Bank Holidays will be processed the next working day.
If urgent, please call one of our helpful account managers so they may double check everything for you, enabling you to place your order with confidence.
Please note: these product details are for guide purposes only, and may contain errors.
We always recommend double-checking the product specs and features on the the manufacturer website, or contact us if unsure before ordering.