What the U35 Bolt+ SSD Is and Why It Matters
The Oyen U35 Bolt+ SSD is a compact USB4 (80Gbps) portable NVMe drive designed to deliver record-breaking transfer speeds for creators and power users working with demanding photo and video workflows. It aims to bring desktop-class throughput to a pocketable enclosure, promising up to 6,000 MB/s transfers that rival or beat many internal laptop drives. According to PetaPixel, the U35 Bolt+ is the fastest external SSD it has ever tested, coming in at over 6,000 MB/s read and write on a modern MacBook Pro with an M5 Max chip. This positions the drive at the upper end of what current USB4 and Thunderbolt 5 interfaces can sustain, making it a headline contender in any fastest SSD review focused on real NVMe performance rather than marketing theory.
Design, Build, and Portability Tradeoffs
Physically, the U35 Bolt+ favors function over style. The enclosure is a small rectangular brick wrapped in a thin silicone layer, broken by exposed aluminum edges that add grip more than serious protection. A removable silicone bumper ring is meant to improve durability, but it feels floppy and comes off easily, raising doubts about its shock-absorbing value. Many users will likely prefer the drive without the bumper, where its light gray shell looks cleaner and remains slip-resistant. There is a single 80 Gbps USB-C port and a deeply recessed reset button; Oyen includes a short 80 Gbps/240W cable that matches typical on-the-road laptop setups. The compact form factor suits mobile shooting and editing, yet the modest passive cooling design foreshadows the main compromise: this highly portable storage speed champ does not have much thermal headroom.
Record-Breaking NVMe Performance on USB4
In controlled benchmarks, the U35 Bolt+ SSD delivers the kind of portable storage speed that turns heads. Out of the box on a latest-generation MacBook Pro with an M5 Max processor, PetaPixel measured 6,064.4 MB/s read and 6,278.8 MB/s write performance, outpacing both the Glyph EX40 and OWC Envoy Ultra by a wide margin. Only Apple’s own internal MacBook Pro SSD remains quicker in its tests. The U35 Bolt+ kept similar numbers even when tested full and then reformatted, showing that its controller manages garbage collection and short bursts of heat without obvious slowdown. This is especially impressive for a non-Thunderbolt-branded drive that uses USB4 with an 80Gbps link but still reaches speeds in the upper third of Thunderbolt 5’s theoretical ceiling. For short transfers and project loads, the NVMe performance feels as fast as the interface will allow.
The Big Asterisk: Thermal Throttling Under Sustained Load
Those headline results hide a serious caveat: sustained workloads expose weak thermals. When PetaPixel filled the 4TB U35 Bolt+ to capacity, performance fell sharply as heat built up. In that stressed state, write speed dropped to 2,244.5 MB/s while read speed dipped to 5,585.3 MB/s, a 63% collapse in write throughput that the reviewer called highly irregular. The drive did not feel unusually hot to the touch, which hints that its controller is aggressive about protecting itself once temperatures rise. Because cooling is entirely passive, the U35 Bolt+ needs a long idle period—about 20 minutes in testing—to recover peak speeds. For workflows that involve continuous recording, long offloads, or nonstop rendering, this behavior is the defining limitation and the reason any fastest SSD review of this model requires a loud, clear asterisk next to the numbers.
Real-World Use Cases, Pricing, and Who Should Buy It
Despite its thermal throttling, the U35 Bolt+ remains fast enough for many practical tasks. Even in its heat-limited state, the drive still sustained performance suitable for ProRes 422 HQ 8K and 12K video playback, which covers a wide range of professional editing scenarios. The bigger concern is consistency rather than raw capability: if your work involves many large, back-to-back transfers, you must accept fluctuating speeds as the drive warms up. On value, Oyen undercuts many rivals. The 4TB model costs USD 969 (approx. RM4,460), with 2TB at USD 599 (approx. RM2,760) and 1TB at USD 459 (approx. RM2,120), while some competing Thunderbolt SSDs reach much higher figures. If you own a recent USB4 or Thunderbolt 5 machine and mostly run bursty, project-based workloads, the U35 Bolt+ SSD is a compelling but imperfect way to tap cutting-edge portable NVMe performance.
