6 Best Alternatives to the OWC Express 1M2 2TB USB4 40Gb/s Portable NVMe SSD (2026)
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The OWC Express 1M2 2TB USB4 40Gb/s Portable NVMe SSD delivers high-speed transfers with a compact, DIY-friendly design. It supports NVMe drives in multiple form factors and maintains cool operation during heavy use. However, you might prefer an alternative if you need a different interface, a fixed capacity, or a more rugged enclosure. Some users seek broader compatibility with older Thunderbolt ports, while others require higher storage densities or specialized enterprise features.
We selected these alternatives because their specifications overlap with the original drive’s key attributes. The list includes options with 40Gbps transfer speeds, NVMe interfaces, and portable form factors. You will find choices that prioritize maximum capacity, specific durability standards, or different physical dimensions. Each option targets a distinct use case, from creative professionals needing rugged storage to IT specialists upgrading server infrastructure. Review the specs to find the drive that matches your exact requirements for speed, size, and interface compatibility.
Our top pick: OWC Express 1M2 2TB USB4 SSD.
How alternatives compare to OWC
SanDisk Professional G-Drive PRO 2TB Thunderbolt 3 SSD
The SanDisk Professional G-Drive PRO uses the older Thunderbolt 3 interface instead of USB4. It offers the same 40Gbps transfer speed but in a slightly larger, ruggedized chassis. You gain enhanced durability for field work, but you lose the flexibility of USB4 compatibility. This drive is ideal if you already have Thunderbolt 3 ports and prioritize physical resilience over the latest interface standards. It does not support DIY installation, so you must buy it with the internal drive included. Choose this if you need a pre-built, tough drive for mobile professionals who do not need USB4 support.
Oyen Digital U34 Bolt 4TB Portable SSD
The Oyen Digital U34 provides 4TB of storage, doubling the capacity of the OWC Express 1M2. It also uses USB4 for 40Gbps speeds, ensuring similar performance for large file transfers. However, it is a fixed-capacity unit rather than a DIY enclosure, so you cannot swap the internal NVMe drive. The form factor is slightly wider but thinner. This option suits users who need double the storage space and prefer a sealed, rugged design over the ability to customize their own drive components. It is best for those who prioritize capacity and ruggedness above all else.
ACASIS 40Gbps Aluminum M.2 NVMe Enclosure
The ACASIS enclosure is a bare metal case that turns your own M.2 NVMe drive into an external SSD. It supports USB4 for 40Gbps speeds, matching the OWC interface. Unlike the OWC, which is a complete solution, this is a DIY component. You must supply your own drive, which can save money if you already have a fast SSD. It supports multiple M.2 form factors, including 2280, 2260, 2242, and 2230. This is the best choice for users who already own a compatible NVMe drive and want a cost-effective, high-speed portable solution without paying for a pre-assembled unit.
Water Panther 960GB U.3 2.5-Inch Enterprise SSD
The Water Panther drive uses a U.3 interface and a 2.5-inch form factor, which is completely different from the portable OWC Express 1M2. It is designed for enterprise server environments, specifically Dell PowerEdge systems, rather than portable laptop use. It does not offer USB4 or Thunderbolt connectivity for direct computer attachment. This product is only relevant if you are upgrading server infrastructure and need U.3 compatibility. For general portable storage needs, this drive is not a viable alternative due to its specialized interface and form factor. It serves a niche IT audience rather than mobile professionals.
Glyph Atom EV 2TB Portable NVMe SSD
The Glyph Atom EV offers 2TB of storage like the OWC, but it uses a different interface strategy focused on ruggedness. It is built for creative professionals who need physical durability. While the OWC emphasizes USB4 speed and DIY flexibility, the Glyph prioritizes shock resistance and broad cable compatibility. It is a pre-assembled unit, so you cannot swap the internal drive. The dimensions are slightly larger and heavier than the OWC. This alternative is best for users who value physical protection and reliability over the absolute latest interface standards or the ability to customize their drive components.
Glyph Atom EX20 4TB Rugged NVMe SSD
The Glyph Atom EX20 provides 4TB of storage, which is double the capacity of the OWC Express 1M2. It is designed for rugged use and media professionals who need high capacity. Like the other Glyph model, it is a pre-assembled unit without DIY flexibility. It focuses on physical resilience and data security rather than USB4 speed. The interface is NVMe, but the external connectivity may differ from the OWC's USB4 standard. This option suits users who need more storage space and prioritize durability over the latest interface technology. It is a robust choice for professionals who work in demanding environments.
Quick picks
Our 7 picks
OWC Express 1M2 2TB USB4 SSD
Best for: USB4/Thunderbolt users needing compact DIY portability
- Storage Capacity
- 2TB
- Interface
- USB4
- Form Factor
- M.2 2280, 2242, 2230
- Cooling
- Solid Aluminum
- Transfer Speed
- 40Gbps
- Host Interface
- USB-C
View on Amazon: OWC Express 1M2 2TB USB4 SSD Affiliate link
The OWC Express 1M2 is a palm-sized portable NVMe SSD enclosure supporting USB4 40Gb/s interfaces. It delivers up to 3836 MB/s read speeds, offering performance over twice that of Thunderbolt portable enclosures. This DIY solution accepts M.2 2280, 2242, or 2230 drives. Its patented heat-dissipating design keeps the drive cool during sustained use. You can use it with USB4, Thunderbolt, or USB-C devices. The unit is bus-powered and includes a 40Gb/s cable and screwdriver.
Pros
- Supports USB4, Thunderbolt, and USB-C interfaces
- Max read speed up to 3836 MB/s
- Patented heat-dissipating design for consistent speeds
- Accepts M.2 2280, 2242, or 2230 SSDs
Cons
- 2TB capacity is lower than 4TB options in this guide
- Requires purchasing a compatible NVMe M.2 SSD separately
- 2-year warranty on enclosure is shorter than 3-year solution warranty
Good fit if
- You need a USB4 or Thunderbolt connection for high speed
- You want a palm-sized, bus-powered portable drive
- You prefer to choose your own NVMe M.2 SSD
Skip if
- You need a pre-built drive with 4TB or more capacity
- You want a single unit without DIY assembly
- You require a longer warranty on the enclosure itself
Verdict: OWC Express 1M2 2TB USB4 Portable SSD fits users who prioritize USB4 speeds and a compact, DIY form factor. It is ideal for those who already own a fast NVMe drive and want a rugged, cool-running enclosure.
SanDisk Professional G-Drive PRO 2TB Thunderbolt 3 SSD
Best for: rugged portable storage with high speed
- Storage Capacity
- 2TB
- Interface
- Thunderbolt 3 (40Gbps)
- Form Factor
- Portable External
- Max Read Speed
- Up to 2800MB/s
- Max Write Speed
- 2400MB/s
- Dimensions
- 4.41 × 3.15 × 0.67 inches
View on Amazon: SanDisk Professional G-Drive PRO 2TB Thunderbolt 3 SSD Affiliate link
The SanDisk Professional 2TB G-Drive PRO is a rugged portable NVMe SSD with Thunderbolt 3 connectivity. It delivers up to 2800MB/s read and 2400MB/s write speeds. The unit features 3M drop protection and 1000lb crush resistance. It includes 2TB of storage in a compact, durable shell. This drive suits professionals who need fast data transfer and high durability for field work.
Pros
- Thunderbolt 3 interface for 40Gbps transfer rates
- Read speeds up to 2800MB/s
- Write speeds up to 2400MB/s
- 3M drop protection and 1000lb crush resistance
- 5-year limited warranty
Cons
- Thunderbolt 3 is older than the USB4/Thunderbolt 4 standard
- Requires reformatting for Windows compatibility
- 2TB capacity is lower than some 4TB alternatives
Good fit if
- You need a rugged drive for harsh environments
- You prioritize read and write speed for large files
- You want a 5-year warranty for peace of mind
Skip if
- You require the latest USB4 or Thunderbolt 4 connectivity
- You need a drive that works with Windows out of the box
- You want more than 2TB of storage in a single unit
Verdict: SanDisk Professional 2TB G-Drive PRO offers high-speed NVMe performance and exceptional durability for mobile professionals. It is ideal for users who need reliable, fast transfers in tough conditions, provided they do not mind the older Thunderbolt 3 interface.
Oyen Digital U34 Bolt 4TB Portable SSD
Best for: High-capacity portable NVMe storage
- Storage Capacity
- 4TB
- Interface
- USB4 40Gbps, Thunderbolt 4
- Form Factor
- Portable
- Max Read Speed
- Up to 2800 MB/s
- Cooling
- Cooling aluminum core
- Host Interface
- USB-C
View on Amazon: Oyen Digital U34 Bolt 4TB Portable SSD Affiliate link
The Oyen Digital U34 offers 4TB of NVMe storage with transfer speeds up to 2800 MB/s. It connects via USB4 40Gbps and Thunderbolt 4. The aluminum core aids cooling, and the drive meets MIL-Standard 810 for rugged use. It suits users needing high capacity and reliable performance for demanding workflows across Mac and Windows systems.
Pros
- 4TB storage capacity for large files
- Up to 2800 MB/s read speeds
- USB4 and Thunderbolt 4 connectivity
- Rugged MIL-Standard 810 construction
- Aluminum cooling core for thermal management
Cons
- Larger physical dimensions than compact alternatives
- Higher price point for 4TB capacity
- Pre-formatted for Mac OS
Good fit if
- You need 4TB of portable NVMe storage
- You require Thunderbolt 4 or USB4 connectivity
- You work with large media files
Skip if
- You prefer a smaller 1TB or 2TB drive
- You need Windows pre-formatting
- You want a lower capacity option
Verdict: Oyen Digital U34 4TB USB4 SSD delivers high capacity and speed for professionals. It fits users who prioritize ruggedness and large storage over compact size.
ACASIS 40Gbps Aluminum M.2 NVMe Enclosure
Best for: Users with existing M.2 NVMe drives
- Interface
- USB4
- Form Factor
- M.2
- Max Read Speed
- 2805 MB/s
- Max Write Speed
- 2734 MB/s
- Cooling
- Aluminum heat-dissipating fins
- Compatibility
- Mac
View on Amazon: ACASIS 40Gbps Aluminum M.2 NVMe Enclosure Affiliate link
The ACASIS TBU405Pro-M1-NEW is a pocket-sized enclosure for M.2 NVMe drives. It uses an Intel JHL7440 chip to support USB4 and Thunderbolt 5, 4, and 3. You get transfer speeds up to 2805 MB/s read and 2734 MB/s write. Dual-sided aluminum fins provide silent passive cooling. It supports drives up to 8TB and fits 2280, 2260, 2242, and 2230 form factors.
Pros
- Supports USB4 and Thunderbolt 5/4/3 for 40Gbps speeds
- Intel JHL7440 chip delivers up to 2805 MB/s read
- Silent dual-sided aluminum fins for passive cooling
- Compatible with M.2 2280, 2260, 2242, and 2230 drives
Cons
- You must buy the NVMe SSD separately
- No built-in battery for portable power
- Heavier at 11.3 ounces than typical portable SSDs
Good fit if
- You already own a fast M.2 NVMe drive
- You need silent operation for recording or office use
- You want 40Gbps speeds on a Mac or PC
Skip if
- You want a single unit with the drive included
- You need a compact all-in-one portable drive
- You require a built-in battery for off-grid use
Verdict: The ACASIS 40Gbps NVMe Enclosure turns your existing M.2 SSD into a high-speed external drive. It is best for users who already have a fast NVMe drive and want silent, professional-grade transfer speeds.
Water Panther 960GB U.3 2.5-Inch Enterprise SSD
Best for: Dell PowerEdge server storage upgrades
- Storage Capacity
- 960GB
- Interface
- PCIe NVMe U.3
- Form Factor
- 2.5"
View on Amazon: Water Panther 960GB U.3 2.5-Inch Enterprise SSD Affiliate link
This Water Panther drive is a 960GB PCIe NVMe U.3 SSD designed for enterprise environments. It features a 2.5-inch form factor and includes an official Dell G16 drive carrier tray. The unit is built for 24/7 operation and supports backward compatibility with U.2 hosts via an adapter. It suits users needing reliable storage for Dell PowerEdge servers like the R750 or R660.
Pros
- 960GB storage capacity for enterprise workloads
- U.3 interface with U.2 backward compatibility
- Includes official Dell G16 drive carrier tray
- Built for 24/7 continuous operation
Cons
- Smaller 960GB capacity compared to 2TB alternatives
- Requires specific server hardware or adapters
- Not designed for consumer desktop or laptop use
Good fit if
- You need storage for a Dell PowerEdge server
- You require 24/7 enterprise-grade reliability
- You are upgrading a server with a U.3 or U.2 interface
Skip if
- You need a portable external drive for a laptop
- You are building a standard consumer desktop PC
- You require more than 960GB of storage space
Verdict: Water Panther 960GB U.3 2.5" Enterprise SSD is a specialized drive for Dell PowerEdge server upgrades. It fits IT professionals managing server infrastructure who need reliable, high-capacity storage for specific enterprise models.
Glyph Atom EV 2TB Portable NVMe SSD
Best for: Rugged portable storage for creative professionals
- Storage Capacity
- 2TB
- Interface
- USB-C 3.2 Gen 2, Thunderbolt 3
- Cooling
- Rugged aluminum chassis
- Dimensions
- 5.6 × 2.9 × 1.8 inches
- Weight
- 8 ounces
View on Amazon: Glyph Atom EV 2TB Portable NVMe SSD Affiliate link
The Glyph Atom EV 2TB is a rugged portable NVMe SSD designed for professionals handling large creative files. It delivers sustained speeds up to 1,050 MB/s via a USB-C 3.2 Gen 2 interface. The aluminum chassis provides passive heat dissipation and durability. It includes both USB-C and USB-A cables for broad compatibility. This drive suits users needing reliable, high-speed storage for 4K video or photo libraries.
Pros
- Sustained NVMe performance up to 1,050 MB/s
- Rugged aluminum chassis for passive heat dissipation
- Includes both USB-C and USB-A cables
- Compatible with Thunderbolt 3 and USB-C 3.x
Cons
- USB-C 3.2 Gen 2 interface limits speeds compared to USB4 options
- Windows requires reformatting for plug-and-play support
- Heavier at 8 ounces compared to lighter alternatives
Good fit if
- You need a rugged drive for demanding environments
- You work with 4K video or large photo libraries
- You prefer passive cooling in a portable form factor
Skip if
- You require USB4 40Gb/s speeds for maximum throughput
- You need native Windows plug-and-play without reformatting
- You prioritize the lightest possible portable storage
Verdict: Glyph Atom EV 2TB Portable NVMe SSD offers rugged durability and solid speeds for creative pros. It fits users who value physical resilience and broad cable compatibility over maximum interface bandwidth.
Glyph Atom EX20 4TB Rugged NVMe SSD
Best for: Rugged 4TB portable storage for media pros
- Storage Capacity
- 4TB
- Interface
- USB 3.2 Gen 2x2
- Form Factor
- External SSD
- Max Read Speed
- Up to 2,100 MB/s
- Max Write Speed
- Up to 2,100 MB/s
- Cooling
- Solid aluminum core and outer shell
View on Amazon: Glyph Atom EX20 4TB Rugged NVMe SSD Affiliate link
The Glyph Atom EX20 is a rugged external NVMe SSD with a 4TB capacity. It delivers up to 2,100 MB/s read and write speeds via a USB 3.2 Gen 2x2 Type-C interface. The solid aluminum core dissipates heat effectively for sustained performance. It meets MIL-Standard 810F for shock and vibration resistance. This drive suits professionals needing high durability and large storage for media workflows.
Pros
- 4TB storage capacity for large files
- Up to 2,100 MB/s read and write speeds
- Solid aluminum core for efficient heat dissipation
- MIL-Standard 810F shock and vibration resistance
Cons
- USB 3.2 Gen 2x2 interface is slower than USB4 or Thunderbolt 4 options
- Higher price point due to 4TB capacity tier
- Larger physical footprint compared to compact 1TB or 2TB models
Good fit if
- You need 4TB of portable storage for 4K video editing
- You work in rugged environments requiring MIL-Standard durability
- You prefer passive aluminum cooling over fan-based solutions
Skip if
- You require USB4 or Thunderbolt 4 connectivity for maximum speed
- You need a compact drive for frequent travel
- You are on a tight budget for high-capacity storage
Verdict: The Glyph Atom EX20 4TB NVMe SSD offers robust durability and solid speeds for professionals who prioritize data security and capacity over the absolute fastest interface standards available.
Specifications side by side
| Spec | OWC Express 1M2 2TB USB4 SSD | SanDisk Professional G-Drive PRO 2TB Thunderbolt 3 SSD | Oyen Digital U34 Bolt 4TB Portable SSD | ACASIS 40Gbps Aluminum M.2 NVMe Enclosure | Water Panther 960GB U.3 2.5-Inch Enterprise SSD | Glyph Atom EV 2TB Portable NVMe SSD | Glyph Atom EX20 4TB Rugged NVMe SSD |
|---|---|---|---|---|---|---|---|
| Storage Capacity | 2TB | 2TB | 4TB | not specified | 960GB | 2TB | 4TB |
| Interface | USB4 | Thunderbolt 3 (40Gbps) | USB4 40Gbps, Thunderbolt 4 | USB4 | PCIe NVMe U.3 | USB-C 3.2 Gen 2, Thunderbolt 3 | USB 3.2 Gen 2x2 |
| Form Factor | M.2 2280, 2242, 2230 | Portable External | Portable | M.2 | 2.5" | not specified | External SSD |
| Max Read Speed | not specified | Up to 2800MB/s | Up to 2800 MB/s | 2805 MB/s | not specified | not specified | Up to 2,100 MB/s |
| Max Write Speed | not specified | 2400MB/s | not specified | 2734 MB/s | not specified | not specified | Up to 2,100 MB/s |
| Cooling | Solid Aluminum | not specified | Cooling aluminum core | Aluminum heat-dissipating fins | not specified | Rugged aluminum chassis | Solid aluminum core and outer shell |
| Compatibility | not specified | not specified | not specified | Mac | not specified | not specified | not specified |
| Transfer Speed | 40Gbps | 40Gbps | 40Gbps | 40Gbps | not specified | not specified | not specified |
| Size | 2.25 | 2TB | 4TB | 2280/2260/2242/2230 | not specified | 2 TB | 4TB |
| Material | Aluminum | not specified | not specified | Aluminum | not specified | not specified | not specified |
| Host Interface | USB-C | not specified | USB-C | not specified | not specified | USB-C | not specified |
| Dimensions | 5.1 × 0.9 × 2.7 inches | 4.41 × 3.15 × 0.67 inches | 4.5 × 2.7 × 0.75 inches | 12 × 8 × 2.5 inches | not specified | 5.6 × 2.9 × 1.8 inches | not specified |
| Weight | 9.88 ounces | 7.04 ounces | not specified | 11.3 ounces | not specified | 8 ounces | not specified |
| Color | Silver | Black | Black | Sliver | not specified | Black | black |
| Model | OWCUS4EXP1MT02 | SDPS51F-002T-GBANB | U34-4T-BK | TBU405Pro-M1-NEW | not specified | A2000EV | A20EX4000 |
Frequently asked questions
Is there a Thunderbolt 3 alternative to the OWC Express 1M2?
Yes, the SanDisk Professional G-Drive PRO 2TB uses the Thunderbolt 3 interface. It delivers the same 40Gbps transfer speed as USB4 models. This drive features a rugged black chassis designed for mobile professionals. You get durable construction, though the older interface may limit future compatibility compared to USB4.
Can I use an enclosure instead of a pre-built portable SSD?
The ACASIS 40Gbps Aluminum M.2 NVMe Enclosure allows you to use your own drive. It supports various M.2 form factors including 2280 and 2260. This DIY approach turns an existing NVMe SSD into a high-speed external drive. You benefit from silent operation and professional-grade transfer speeds without buying a full unit.
What is the best high-capacity USB4 portable SSD option?
The Oyen Digital U34 Bolt 4TB Portable SSD offers significant storage capacity. It supports USB4 connections for 40Gbps transfer speeds. This black drive is built for rugged use in professional environments. You get large storage for media files, though the unit is slightly larger than compact DIY enclosures.
Are there rugged portable SSDs for creative professionals?
The Glyph Atom EV 2TB and Atom EX20 4TB are designed for durability. Both use NVMe interfaces for reliable performance in tough conditions. The Atom EV focuses on resilience and broad cable compatibility. The Atom EX20 provides 4TB of space for media professionals who prioritize data security and physical protection over maximum bandwidth.
Is there a 2.5-inch NVMe drive for server upgrades?
The Water Panther 960GB U.3 2.5-Inch Enterprise SSD fits specific server needs. It uses the NVMe interface for high performance. This drive is intended for Dell PowerEdge server upgrades. IT professionals can use it for reliable storage in enterprise infrastructure, though it is not a standard portable solution for general users.
How do the dimensions of portable NVMe SSDs vary?
Portable drives range from compact DIY enclosures to ruggedized units. The OWC Express 1M2 is small at 2.25 inches wide. The SanDisk G-Drive PRO is larger at 3.15 inches wide for added durability. The ACASIS enclosure is the largest, measuring 8 inches wide. You can choose based on whether you prioritize portability or physical protection.