Description & Specifications
OWC Express 4M2
Four-Slot USB4 (40Gb/s) External Storage Enclosure with SoftRAID for NVMe M.2 2230 / 2242 / 2280 SSDs
Mfr P/N: US4EXP4M2S OWC SKU: OWCUS4EXP4M2S
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
- Includes SoftRAID: robust software for creating, monitoring, and managing advanced RAID sets
- 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 Express 4M2 (Digital)
- (1) 3 Years of SoftRAID Premium Access (License located on device)
- (1) Quick Start Guide for OWC SoftRAID (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
Other Requirements
- When using one or more SSDs with 512 byte sectors, macOS 10.13 or later is required.
- SoftRAID works with macOS 10.14 or later and Windows 10 or later. SoftRAID is licensed per computer. The SoftRAID serial number will work with both Mac and Windows but can only be active on one computer at a time. Additional seats can be purchased.
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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