OWC Express 4M2 Enclosure 4x M.2 NVMe SSD USB4 | Thunderbolt | 40 GB/s New model!

The new OWC Express 4M2 is an extremely configurable, compatible, and compact DIY RAID kit. It is a four-bay enclosure for M.2 NVMe SSDs with up to 32TB of capacity and speeds of up to 3200 MB/s (40 Gb/s). 

The OWC Express 4M2 is compatible with Thunderbolt 5, Thunderbolt 4, Thunderbolt 3, USB4, and USB-C ports and offers the ability to create a software-based RAID 0/1/4/5/1+0 (10) system. RAID software is not included with the kit.

OWC Express 4M2 delivers high performance: actual data transfer speeds up to 3200 MB/s

Thanks to its high compatibility: compatible with Mac and PC computers equipped with USB4, Thunderbolt, and USB-C connectors OWC Express 4M2 USB4 | Thunderbolt 40 Gb/s is versatile and can be used in any work environment.

OWC Express 4M2 is highly reliable: aircraft-grade aluminum provides solid protection for installed SSDs and effective heat dissipation to keep everything cool and running at maximum speed

Nearly silent operation: designed with intelligent, adaptive fans that only turn on when needed or under heavy load, making it ideal for uninterrupted creative work.

OWC Express 4M2 is designed for RAID: just add your own RAID management software, such as OWC SoftRAID — the fastest and most flexible RAID 0/1/4/5/1+0 (10) tool. OWC Express 4M2 also supports Apple RAID and Windows Disk Manager.

The best DIY RAID kit you've been dreaming of

OWC understood your expectations perfectly when you said that you like everything about the Express 4M2, but would like it to be quieter. After adding smart adaptive fans that only turn on when necessary, ensuring near-silent operation, they decided to equip it with a USB4 connector for the optimal combination of compatibility, performance, and affordability. Now you can build a high-performance RAID system for your desktop/shuttle computer with your choice of NVMe M.2 SSDs and get up to 3200 MB/s performance with USB4, Thunderbolt, and USB-C on Mac and PC computers.

Maximum speed for your work environment

OWC Express 4M2 is the fastest enclosure for multiple NVMe SSDs in the OWC lineup, designed specifically to help you get the most out of your Mac or PC while maintaining full compatibility:

The choice is yours

Designed to support all NVMe M.2 2230, 2242, or 2280 SSDs, this compact, powerful product offers the ultimate flexibility to choose the drive you need today—including OWC Aura SSDs with capacities up to 8.0TB each. When drives with capacities of 16 TB and above become available, you can easily increase the capacity of your OWC Express 4M2.

One cool RAID for different workflows

Fast backups, reading multiple memory cards, and intensive RAW photo and 8K video editing sessions mean one thing... Heat. You don't have to worry about overheating and noise, because the OWC Express 4M2 has a sturdy aluminum case that dissipates heat and smart, adaptive fans that only turn on when needed or when the device is under heavy load. Versatility also means you can easily work across platforms such as Mac and PC. We help you stay calm in mixed environments with our MacDrive software (sold separately).

Technical specifications

• Drive bays: 4 bays supporting: M.2 SSD drives
• Supports single-sided and double-sided M.2 2280, M.2 2242, M.2 2230 “M Key” drives
• NVMe SSD drives with heat sinks are not supported.
• Each slot offers PCIe 4.0 x1 performance.
• Single drive performance up to 1600 MB/s.
• Hot-plug support: Yes
• Boot support: All four drive bays are bootable in macOS. SSDs with 512-byte sectors require macOS 10.13 or later. Boot Camp is not supported.
• RAID support: Yes
• Supported RAID levels: RAID 0, RAID 1, RAID 4, RAID 5, RAID 10, JBOD
• RAID features: Software RAID not included in the kit
• Device ports: 1x Host port — USB4 (USB-C) up to 40 Gb/s (5000 MB/s) — USB 3.2 Gen 2 (USB-C) up to 10 Gb/s (1250 MB/s) backward compatible
• UASP support: UASP support (USB Attached SCSI Protocol)
• Data transfer rate (maximum): USB4: up to 40 Gb/s (or 3200 MB/s), USB 3.2 Gen 2: up to 10 Gb/s (or 1250 MB/s)
• Chipset/controller: USB4: Asmedia ASM-2464PDX
• Host interface requirements: Works with any USB 3.2 Gen 2 (USB-C) and newer, Mac, PC, or Linux systems equipped with Thunderbolt 3 and newer
• Mac OS compatibility: macOS 14.x Sonoma, macOS 15.x Sequoia
• PC operating system compatibility: Windows 10 32-bit Edition, Windows 10 64-bit Edition, Windows Server 2019, Windows Server 2016, Windows Server 2022, Windows 11
• Driver required: No
• External power supply: Yes
• Power supply: UL-certified external power supply with automatic switching
• Power: 48 W
• Fans: 2x 40 mm cooling fans, 4000 rpm < 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
• Housing material: Aluminum
• Dimensions: Height: 13.9 cm (5.5 inches), Length: 17.8 cm (7.0 inches), Width: 6.0 cm (2.4 inches)
• Weight: 1.8 kg (3.97 pounds)
• Certifications: CE, FCC, UKCA, ICES, RCM, VCCI