Description & Specifications
OWC Express 4M2
Four-Slot USB4 (40Gb/s) External Storage Enclosure for NVMe M.2 2230 / 2242 / 2280 SSDs
Mfr P/N: US4EXP4M2 OWC SKU: OWCUS4EXP4M2
The incredibly configurable, compatible, and compact DIY RAID
- 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
- Built for RAID: just add your own RAID management software, like 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
Includes
- (1) OWC Express 4M2 USB4 (40Gb/s) External Storage Enclosure
- (1) 0.7M (28") USB-C 40Gb/s Cable
- (1) External Power Supply
- (1) US Power Cable (2-Prong IEC C7)
- Support Manual for OWC USB4 Express 4M2 (digital)
- 2 Year OWC Limited Warranty
Need an additional power supply? Secondary/replacement power supplies may also be available.
Specs
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
Mac OS Compatibility
- macOS 14.x Sonoma
- macOS 15.x Sequoia
- macOS 26.x Tahoe
PC OS 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 Adapter
- Yes
Power Supply
- External UL-listed universal auto-switching power supply
- Need an additional power supply? Secondary/replacement power supplies may also be available.
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(s)
- Yes
Housing Color
- Silver
Housing 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)
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