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Product Description
The Ultimate DIY RAID Enclosure
Build your ideal high-performance storage with the OWC Express 4M2 – the configurable, compact RAID enclosure designed for speed, silence, and flexibility. With support for USB4, Thunderbolt, and USB-C, and up to 3200MB/s real-world performance, it’s perfect for creative professionals, content creators, and power users.
Key Features:
High-Speed Performance: Up to 3200MB/s transfer speeds with USB4/Thunderbolt/USB-C devices.
Universal Compatibility: Works with USB4, Thunderbolt 3/4, and USB-C Macs and PCs.
Smart Cooling: Adaptive fans only activate under heavy load for near silent operation.
DIY Flexibility: Install your choice of NVMe M.2 2230, 2242, or 2280 SSDs. (up to 4 x M.2 NVME SSDs)
Rugged & Efficient: Aircraft-grade aluminum body offers durable heat dissipation.
Advanced RAID Management: Includes 3 years of SoftRAID Premium for RAID 0/1/4/5/10.
Complete Bundle: Includes USB-C 40Gb/s cable, power supply, and quick start guides.
2-Year OWC Limited Warranty
Ideal For:
• DITs and filmmakers needing a high-speed, RAID 5-capable backup system on set.
• Video editors, VFX artists, and photographers working with 8K RAW and large batch media.
• Anyone seeking a powerful, affordable RAID alternative to ThunderBlade with NVMe speed.
Note:
-
Each bay offers PCIe 4.0 x1 performance
- Single drive performance up to 1600MB/s
- It is recommended to fill all 4 bays with SSD for best performance. Or at least 2 bays and create RAID. For single SSD use, please check OWC 1M2
Thunderbolt / USB4 speed chart
What's in the Box:
• (1) OWC Express 4M2 USB4 (40Gb/s) Enclosure
• (1) 0.7M USB-C 40Gb/s Cable
• (1) External Power Supply
• (1) UK Power Cable (EU power cable for EU buyers)
• (1) Quick Start Guide (Digital)
• (1) 3 Years of SoftRAID Premium (License on device - Option)
• (1) User Manual (Digital)
Specifications
Drive Bays
4 bays supporting: M.2 SSDs
Supports single-sided and double-sided M.2 2280, M.2 2242, M.2 2230 "M Key" drives
NVMe SSDs with a heatsink are not supported
Each bay offers PCIe 4.0 x1 performance
Single drive performance up to 1600MB/s
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. Boot Camp is not supported
RAID Capable
Yes
RAID Levels Supported
RAID 0
RAID 1
RAID 4
RAID 5
RAID 10
JBOD
RAID Features
Software RAID
Device Ports
(1) Host Port - USB4 (USB-C) up to 40Gb/s (5000MB/s)
USB 3.2 Gen 2 (USB-C) up to 10Gb/s (1250MB/s) backwards compatible
UASP Support
UASP (USB Attached SCSI Protocol) is supported
Data Transfer Rate (Maximum)
USB4: Up to 40Gb/s (or 5000MB/s)
USB 3.2 Gen 2: Up to 10Gb/s (or 1250MB/s)
Chipset / Controller
USB4: Asmedia ASM-2464PDX
MTBF (Mean Time Between Failures)
Varies depending on drive mechanism installed
Host Interface Requirements
Works with any USB 3.2 Gen 2 (USB-C) and later
Thunderbolt 3 and later equipped Mac, PC, or Linux system
Driver Required
No
External Power Adapter
Yes
Power Supply
External UL-listed universal auto-switching power supply
AC Input: 100-240V, 50-60Hz, 1.5A
DC Output: +12V, 4A
Wattage: 48W
Fans
(2) 40mm 4,000RPM cooling fans
< 35°C (FAN OFF) | >= 35°C (FAN-PWM 40%) | >= 45°C (FAN-PWM 60%) | >= 50°C (FAN-PWM 80%) | >= 55°C (FAN-PWM 100%)
Security Slot
No
Power/Activity LED
Yes
Housing
Color: Silver
Material: Aluminum
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)
Certifications
CE, FCC, UKCA, ICES, RCM, VCCI
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)
Altitude
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)
Compatibility
Mac OS Compatibility
macOS 14.x Sonoma
macOS 15.x Sequoia
PC OS Compatibility
Windows 10 32-bit Edition
Windows 10 64-bit Edition
Windows Server 2016
Windows Server 2019
Windows Server 2022
Windows 11
System Notes
For best performance, the USB mode switch should be kept in the factory USB4 40Gb/s setting when connecting to:
Mac: Thunderbolt 5, Thunderbolt 4, USB4, or Thunderbolt 3 Intel based systems running macOS 15.x or later.
Windows: Thunderbolt 5, Thunderbolt 4, or USB4 systems running Windows 11 or later.
For compatible performance on older systems, switch to USB3.2 10Gb/s mode for:
Mac: Intel systems running macOS 14.x or earlier.
Windows: Thunderbolt 3 or USB 3.2 10Gb/s systems running Windows 10 or later.
Compatibility
Mac OS Compatibility: macOS 14.x Sonoma, macOS 15.x Sequoia
PC OS Compatibility: Windows 10 32-bit Edition, Windows 10 64-bit Edition, Windows Server 2016, Windows Server 2019, Windows Server 2022, Windows 11
Connection Notes: USB4 mode (40Gb/s) recommended for Thunderbolt 5, Thunderbolt 4, USB4, or Thunderbolt 3 Intel Macs on macOS 15.x+, Windows Thunderbolt 5/4/USB4 on Windows 11+; USB 3.2 10Gb/s mode recommended for Intel Macs macOS 14.x or earlier, Windows Thunderbolt 3/USB 3.2 systems on Windows 10+
Product Videos
Shipping & Returns
- Free UK Shipping: Delivered in approx. 2 working days
- Express Options: Faster methods available at checkout
- Free Shipping to Ireland: For orders over £100.00
- International Delivery: Times vary by destination; shipped via FedEx or DHL
- 30-Day Returns: Return within 30 days from order date
- UK and Ireland Customers: Free return label provided
- Full Return Policy: Read Here
- Full Shipping Details: Read Here
Payment
Safe payment on our website.
Pay by card, Klarna, PayPal, Apple Pay, G-Pay, Shop Pay, Revolut, Bancontact, iDeal, or even bank transfer.
Customer Service
Email and chat available 24/7
Free number UK: 08001954072
International: +442838341148
Phone Line Opening Hours
- Monday-09:00-17:00
- Tuesday-09:00-17:00
- Wednesday-09:00-17:00
- Thursday-09:00-17:00
- Friday-09:00-17:00
OWC Express 4M2 USB4 RAID Enclosure – 4-Bay M.2 NVMe SSD, Up to 3200MB/s
The Ultimate DIY RAID Enclosure
Build your ideal high-performance storage with the OWC Express 4M2 – the configurable, compact RAID enclosure designed for speed, silence, and flexibility. With support for USB4, Thunderbolt, and USB-C, and up to 3200MB/s real-world performance, it’s perfect for creative professionals, content creators, and power users.
Key Features:
High-Speed Performance: Up to 3200MB/s transfer speeds with USB4/Thunderbolt/USB-C devices.
Universal Compatibility: Works with USB4, Thunderbolt 3/4, and USB-C Macs and PCs.
Smart Cooling: Adaptive fans only activate under heavy load for near silent operation.
DIY Flexibility: Install your choice of NVMe M.2 2230, 2242, or 2280 SSDs. (up to 4 x M.2 NVME SSDs)
Rugged & Efficient: Aircraft-grade aluminum body offers durable heat dissipation.
Advanced RAID Management: Includes 3 years of SoftRAID Premium for RAID 0/1/4/5/10.
Complete Bundle: Includes USB-C 40Gb/s cable, power supply, and quick start guides.
2-Year OWC Limited Warranty
Ideal For:
• DITs and filmmakers needing a high-speed, RAID 5-capable backup system on set.
• Video editors, VFX artists, and photographers working with 8K RAW and large batch media.
• Anyone seeking a powerful, affordable RAID alternative to ThunderBlade with NVMe speed.
Note:
-
Each bay offers PCIe 4.0 x1 performance
- Single drive performance up to 1600MB/s
- It is recommended to fill all 4 bays with SSD for best performance. Or at least 2 bays and create RAID. For single SSD use, please check OWC 1M2
Thunderbolt / USB4 speed chart
What's in the Box:
• (1) OWC Express 4M2 USB4 (40Gb/s) Enclosure
• (1) 0.7M USB-C 40Gb/s Cable
• (1) External Power Supply
• (1) UK Power Cable (EU power cable for EU buyers)
• (1) Quick Start Guide (Digital)
• (1) 3 Years of SoftRAID Premium (License on device - Option)
• (1) User Manual (Digital)
Drive Bays
4 bays supporting: M.2 SSDs
Supports single-sided and double-sided M.2 2280, M.2 2242, M.2 2230 "M Key" drives
NVMe SSDs with a heatsink are not supported
Each bay offers PCIe 4.0 x1 performance
Single drive performance up to 1600MB/s
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. Boot Camp is not supported
RAID Capable
Yes
RAID Levels Supported
RAID 0
RAID 1
RAID 4
RAID 5
RAID 10
JBOD
RAID Features
Software RAID
Device Ports
(1) Host Port - USB4 (USB-C) up to 40Gb/s (5000MB/s)
USB 3.2 Gen 2 (USB-C) up to 10Gb/s (1250MB/s) backwards compatible
UASP Support
UASP (USB Attached SCSI Protocol) is supported
Data Transfer Rate (Maximum)
USB4: Up to 40Gb/s (or 5000MB/s)
USB 3.2 Gen 2: Up to 10Gb/s (or 1250MB/s)
Chipset / Controller
USB4: Asmedia ASM-2464PDX
MTBF (Mean Time Between Failures)
Varies depending on drive mechanism installed
Host Interface Requirements
Works with any USB 3.2 Gen 2 (USB-C) and later
Thunderbolt 3 and later equipped Mac, PC, or Linux system
Driver Required
No
External Power Adapter
Yes
Power Supply
External UL-listed universal auto-switching power supply
AC Input: 100-240V, 50-60Hz, 1.5A
DC Output: +12V, 4A
Wattage: 48W
Fans
(2) 40mm 4,000RPM cooling fans
< 35°C (FAN OFF) | >= 35°C (FAN-PWM 40%) | >= 45°C (FAN-PWM 60%) | >= 50°C (FAN-PWM 80%) | >= 55°C (FAN-PWM 100%)
Security Slot
No
Power/Activity LED
Yes
Housing
Color: Silver
Material: Aluminum
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)
Certifications
CE, FCC, UKCA, ICES, RCM, VCCI
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)
Altitude
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)
Compatibility
Mac OS Compatibility
macOS 14.x Sonoma
macOS 15.x Sequoia
PC OS Compatibility
Windows 10 32-bit Edition
Windows 10 64-bit Edition
Windows Server 2016
Windows Server 2019
Windows Server 2022
Windows 11
System Notes
For best performance, the USB mode switch should be kept in the factory USB4 40Gb/s setting when connecting to:
Mac: Thunderbolt 5, Thunderbolt 4, USB4, or Thunderbolt 3 Intel based systems running macOS 15.x or later.
Windows: Thunderbolt 5, Thunderbolt 4, or USB4 systems running Windows 11 or later.
For compatible performance on older systems, switch to USB3.2 10Gb/s mode for:
Mac: Intel systems running macOS 14.x or earlier.
Windows: Thunderbolt 3 or USB 3.2 10Gb/s systems running Windows 10 or later.
Mac OS Compatibility: macOS 14.x Sonoma, macOS 15.x Sequoia
PC OS Compatibility: Windows 10 32-bit Edition, Windows 10 64-bit Edition, Windows Server 2016, Windows Server 2019, Windows Server 2022, Windows 11
Connection Notes: USB4 mode (40Gb/s) recommended for Thunderbolt 5, Thunderbolt 4, USB4, or Thunderbolt 3 Intel Macs on macOS 15.x+, Windows Thunderbolt 5/4/USB4 on Windows 11+; USB 3.2 10Gb/s mode recommended for Intel Macs macOS 14.x or earlier, Windows Thunderbolt 3/USB 3.2 systems on Windows 10+