OWC
4TB Express 1M2 40Gb/s Portable NVMe SSD USB4 (Thunderbolt Compatible/USB-C) Ultra Fast External SSD Drive with Aluminum Heat Sink Enclosure
*Price sourced from Amazon.com. Last updated 2026-07-22. Price and availability subject to change.
Bottom line: The 4TB Express 1M2 40Gb/s Portable NVMe SSD USB4 (Thunderbolt Compatible/USB-C) Ultra Fast External SSD Drive with Aluminum Heat Sink Enclosure is a niche pick — read recent reviews before buying in the external storage category, priced around $149.99. Read recent reviews carefully before committing.
SpecPicks Verdict
SpecPicks classifies OWC 4TB Express 1M2 40Gb/s Portable NVMe SSD USB4 (Thunderbolt… as a niche pick — read recent reviews before buying in the external storage category, based on our editorial and benchmark analysis and our ranking model that weights rating × review-volume × price-fit. OWC's positioning sits within the broader category mid-tier. Use the Compare tool to put it side-by-side with two or three close alternatives before clicking through to Amazon.
Common buyer scenarios for external storage of this kind: matching it to an existing build, replacing a failing part, or upgrading from a previous-generation equivalent. Check the spec table below against your current setup — particularly socket / form-factor / power-rating fields — and confirm compatibility on the Amazon listing before purchase. Prices, stock, and Prime eligibility update directly from Amazon's catalog and may have moved since this page was last verified.
Pros & Cons
Pros
- ✓ Ultra-compatible: use with USB4, Thunderbolt, and USB-C computers and devices
- ✓ Backed by OWC's warranty and support channels
- ✓ Ships via Amazon with Prime eligibility and the standard returns policy
Cons
- ✗ Confirm socket / form-factor / power-rating compatibility against your build before ordering
- ✗ Price, stock, and Prime eligibility update from Amazon and may have changed since this page was last verified
Key Features
- Ultra-fast: over 2x faster than Thunderbolt portable enclosures with up to 3836MB/s real-world performance
- Ultra-compatible: use with USB4, Thunderbolt, and USB-C computers and devices
- Ultra-reliable & Innovative: Patent pending heat-dissipating design offers rugged protection of your SSD while silently keeping drive cool for consistent top speed
- Flexible DIY: use your choice of NVMe M.2 2280, 2242, or 2230 SSD
- Portable: bus-powered and palm-sized for convenient use anywhere
- Complete: includes 40Gb/s USB-C cable and screwdriver for enclosure
Full Specifications
| Brand | OWC |
|---|---|
| Color | Silver |
| Complete | includes 40Gb/s USB-C cable and screwdriver for enclosure |
| Portable | bus-powered and palm-sized for convenient use anywhere |
| Model Name | Express 1M2 |
| Read Speed | 3151 Megabytes Per Second |
| Ultra-fast | over 2x faster than Thunderbolt portable enclosures with up to 3836MB/s real-world performance |
| Unit Count | 1.0 Count |
| Worry-free | 2 Year (enclosure) or 3 Year (solution) OWC Limited Warranty |
| Form Factor | portable |
| Media Speed | 3151 Megabytes Per Second |
| Connectivity | USB-C |
| Flexible DIY | use your choice of NVMe M.2 2280, 2242, or 2230 SSD |
| Model Number | OWCUS4EXP1MT01 |
Ready to buy?
OWC 4TB Express 1M2 40Gb/s Portable NVMe SSD USB4 (Thunderbolt Compatible/USB-C) Ultra Fast External SSD Drive with Aluminum Heat Sink Enclosure is available on Amazon with Prime shipping and the full Amazon returns policy. SpecPicks earns a small commission on qualifying purchases — thank you for supporting independent review work.
*Price sourced from Amazon.com. Last updated 2026-07-22. Price and availability subject to change.
Related External Storage
More guides & deep dives from the SpecPicks archive
Browse all articles & guides →- How to Build a Windows 98 Retro PC in 2026
- Best 1440p Gaming GPUs in 2026
- RTX 4070 Super vs RX 7800 XT — Which to Buy in 2026
- Best Retro Handhelds in 2026 — From $35 to $500
- Emulation Hardware in 2026: FPGA, Software, and Cart-Reader Ecosystems
- The Complete Voodoo5 5500 AGP Driver Guide (2026 Edition)
- Best Budget Gaming PC Build 2026 — ~$1,000 ($800 on Sale)
More reviews from the SpecPicks archive
Browse all reviews →- Oomwoo Is a New Open-Source Robot Vacuum You Can 3D Print
- Best Budget GPU for Local LLM Inference in 2026
- Ethernet WiFi Router on a Pi Pico 2W: What's Possible
- Best 1440p 240Hz Gaming Monitors in 2026
- Best Steam Deck Dock for 4K Desktop Gaming in 2026: JSAUX Docking Station Tested Against the Use Case
- How to Find and Join Active UT99 and UT2004 Servers in 2026
- KOORUI 27" QD-Mini LED vs Samsung Odyssey: Best 4K Pick
- Pentium II/III LAN Party Build Brand Profile: Why Creative and 3dfx Defined the Era
- Gemma-4-Harmonia-31B Heretic: What the Uncensored Merge Adds Over Base Gemma 4
- LLM VRAM Requirements by Model in 2026: What Fits 12GB, 24GB, 48GB
- Anthropic Tightens Claude Fable 5 Limits — Why Builders Are Eyeing Local Rigs
- Best Streaming Gear for New Streamers in 2026: 5 Picks to Start On-Air
- Best Wireless Gaming Controllers for PC and Console in 2026
- Forza Horizon 6: Is 8GB VRAM Enough or Do You Need an RTX 3060 12GB?
- Why Direct3D Killed Glide: How the 3dfx Voodoo Empire Lost the API Wars
- How to Image and Preserve a Vintage IDE Hard Drive in 2026 (CompactFlash + USB Adapter Workflow)
- CompactFlash as a Win98 Boot Drive: Transcend CF133 + IDE Adapter Walkthrough
- Build an 8-Node Raspberry Pi Cluster for Distributed Computing (2026)
- Qwen 3.6 vs Frontier Models on a Local Rig: The Honest Gap
- Which GPU Does Each Popular LLM Actually Need in 2026?
- Best Budget PC Gaming Upgrades Under $150 in 2026
- Raspberry Pi LLM Cluster: What It Can (and Can't) Do
- Ryzen 5 5600G vs RTX 3060 12GB for Entry Local LLM Inference (2026)
- ComfyUI on an RTX 3060 12GB: Local Image Generation Setup