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Black rectangular portable SSD with rounded edges and matte aluminium finish

Oyen Digital

Oyen Digital U34 Bolt 4TB USB4 portable SSD

SKU CH-930P-4WX1Q

4 TB portable NVMe SSD with USB4 40 Gbps interface delivering up to 2 800 MB/s transfer speeds and MIL-STD-810 ruggedisation

  • Total capacity4 TB
  • Interface typeUSB4
  • Product colorBlack
  • Sustained transfers up to 2800 MB/s turn hours of work into minutes
  • USB4 40 Gbps with Thunderbolt 3 and 4 compatibility connects to any modern host
  • MIL-Standard 810F shock, vibration and dust rating protects data in harsh environments
  • Aluminium core keeps internal temperature stable under heavy workloads
  • 3000 TBW on the 4 TB model indicates high write endurance

Capacity and interface

The Oyen Digital U34 Bolt is a 4 TB external SSD that connects through a USB-C port running USB4 at 40 Gbps. It uses an NVMe PCIe 4.0 x4 controller with TLC NAND flash to reach sequential speeds up to 2800 MB/s. The drive ships formatted in HFS+ for macOS and can be reformatted for other systems.

Practical limits of USB4 40 Gbps

The 2800 MB/s ceiling is only available when the host supplies a USB4 or Thunderbolt 3/4 connection with full 40 Gbps bandwidth. On older USB 3.2 or USB 3.1 ports the drive will fall back to the host's lower signalling rate, so sustained throughput drops accordingly. The ASMedia ASM2464PD bridge handles the protocol conversion, but total performance remains bound by the host link. Operating temperature range is 32 °F to 158 °F.

Upgrade path and when it matters

This drive replaces slower USB 3.x portable SSDs and mechanical external drives for workflows that move multi-gigabyte files such as 4K video, RAW photo libraries or large project archives. The 3000 TBW endurance rating supports heavy daily writes, and the MIL-STD-810F ruggedisation adds confidence for field use. Buyers whose hosts top out at 10 Gbps USB will not see the advertised speed and should consider whether the premium is justified.

How it compares

Measured against everything we stock in Portable USB SSDs, at today’s prices. Recalculated every night.

Price $750.99
Pricier than about 90% of the 410 comparable items (median $202.99).
Total capacity 4 TB
Higher than about 90% of the 311 comparable items (median 1 TB).
Price per TB $187.75 per TB
Pricier than about 71% of the 310 comparable items (median $142.00 per TB).

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Specifications

Product
Brand nameOyen Digital
Product lineU34 Bolt
Total capacity4 TB
Product colorBlack
Ports & slots
Interface typeUSB4

Questions about this item

Should I pick the 4TB or 8TB version of the U34 Bolt?

The 4TB model offers 3000 TBW endurance while the 8TB model doubles that to 6000 TBW, so choose based on how much data you write over the drive's life.

What does the 2800 MB/s headline speed mean when I plug the drive into my laptop?

That is the maximum sequential transfer rate over USB4 40Gbps; actual throughput depends on your host controller, cable quality, file sizes and thermal conditions.

The drive uses USB4 40Gbps — what does that cap in practice?

The USB4 40Gbps interface caps the theoretical bandwidth at 40 gigabits per second, which translates to the stated 2800 MB/s sequential ceiling for this NVMe SSD.

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