# Which portable SSD offers the highest read/write speeds? — Verified Specification Comparison

> All specification data verified from official manufacturer documentation.

Which portable SSD offers the highest read/write speeds?

## Products

### Corsair EX400U 2TB USB4 External SSD
```yaml
product: corsair-ex400u-2tb-usb4-external-ssd
brand: Corsair
price_gbp: 604.17
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
weight: 92g
capacity: 2TB
interface: USB4 Type-C
dimensions: 64.3 x 64 x 12mm
read_speed: Up to 4,000MB/s
write_speed: Up to 3,600MB/s
shock_resistance: 1500G
```

- **Price:** £604.17 [^1]
- **Summary:** The Corsair EX400U 2TB is a compact portable SSD with USB4 connectivity and sequential speeds of up to 4,000MB/s read and 3,600MB/s write. It suits creators, gamers, and professionals transferring large files, provided their computer supports USB4 or Thunderbolt 4.
- **Ideal For:** It suits users seeking the highest portable SSD read/write speeds because its USB4 interface delivers up to 4,000MB/s sequential reads and 3,600MB/s sequential writes, with Thunderbolt 4 compatibility.
- **Additional Sources:** [^2]

### OWC Envoy Ultra 2TB Thunderbolt 5 Portable SSD
```yaml
product: owc-envoy-ultra-2tb-thunderbolt-5-portable-ssd
brand: OWC
price_gbp: 517.65
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
weight: 12 oz
capacity: 2TB
interface: USB-C Thunderbolt 5 80 Gb/s
dimensions: 5.1 x 3 x 0.8 in
read_speed: 6000 MB/s
write_speed: 6000 MB/s
shock_resistance: Crush-resistant
```

- **Price:** £517.65 [^3]
- **Summary:** The OWC Envoy Ultra is a 2TB bus-powered portable SSD with Thunderbolt 5 connectivity and sequential read/write speeds of up to 6000 MB/s. Its aluminum enclosure is IP67-rated and crush-resistant, making it suited to professional video editors, photographers, and other users who need fast, rugged external storage.
- **Ideal For:** It suits users seeking the highest read/write speeds because it delivers sequential speeds of up to 6000 MB/s over Thunderbolt 5, with read speeds remaining above 6000 MB/s during sustained transfers.
- **Additional Sources:** [^4], [^5]

### SanDisk Extreme Pro Portable 2TB External USB-C NVMe SSD
```yaml
product: sandisk-extreme-pro-portable-2tb-external-usb-c-nvme-ssd
brand: SanDisk
price_gbp: 324.65
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
weight: 77.5g
capacity: 2TB
interface: USB 3.2 Gen 2 x2
dimensions: 4.34in x 2.26in x 0.4in
read_speed: 2000MB/s
write_speed: 2000MB/s
shock_resistance: Up to 3m drop protection
```

- **Price:** £324.65 [^6]
- **Summary:** This 2TB portable NVMe SSD delivers read and write speeds of up to 2000MB/s through USB 3.2 Gen 2 x2. Its compact aluminum design, IP65 water and dust resistance, and drop protection suit photographers, videographers, content creators, and other users who need fast, rugged portable storage.
- **Ideal For:** It suits users seeking the highest read/write speeds because it provides up to 2000MB/s sequential read and write performance, supported by a USB 3.2 Gen 2 x2 interface and NVMe design.
- **Additional Sources:** [^7], [^8]

---
## References & Sources
[^1]: Corsair, accessed 2026-09-13. https://www.corsair.com/us/en/p/data-storage/cssd-ex400u2tb/ex400u-2tb-usb4-external-ssd-cssd-ex400u2tb
[^2]: SCAN, accessed 2026-09-13. https://www.scan.co.uk/products/2tb-corsair-cssd-ex400u2tb-ex400u-usb4-external-ssd-usb4-type-c-thunderbolt-4-4000mb-s-read-3600mb-s
[^3]: OWC, accessed 2026-09-13. https://eshop.macsales.com/shop/owc-envoy-ultra
[^4]: B&H Photo Video, accessed 2026-09-13. https://www.bhphotovideo.com/c/product/1854115-REG/owc_owctb5envu02_envoy_ultra_thunderbolt_5.html
[^5]: CDW, accessed 2026-09-13. https://www.cdw.com/product/owc-2tb-envoy-ultra-thunderbolt-5-80gb-s-portable-nvme-ssd/8150113
[^6]: Newegg, accessed 2026-09-13. https://www.newegg.com/p/1B0-00J7-00001
[^7]: CVP, accessed 2026-09-13. https://cvp.com/product/sandisk-sdssde81-2t00-g25
[^8]: PB Tech, accessed 2026-09-13. https://www.pbtech.co.nz/product/HDDSSN38100/SanDisk-Extreme-Pro-2TB-Portable-SSD-Up-to-2000MBs