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SANDISK Professional 1TB PRO-G40 SSD - Up to 3000MB/s, Thunderbolt 3 (40Gbps), USB-C (10Gbps), IP68 dust/Water Resistance, External Solid State Drive - SDPS31H-001T-GBCND | Up to 3000MB per S Read, Thunderbolt 3 and USB-C, IP68 Water and Dust, 3m Drop and 4000lb Crush, 5-Yr Warranty

SANDISK Professional 1TB PRO-G40 SSD

Bottom line: The SANDISK Professional 1TB PRO-G40 SSD: Up to 3000MB/s read over Thunderbolt 3 (40Gbps) - 50GB moves in a minute or less; main trade-off: thunderbolt-class pricing sits well above USB 3.2 portable SSDs at the same 1TB.

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By , Founder & Editor-in-Chief · Listing data updated

Mike Perry — Hardware researcher since 2014. For SSDs and PC storage upgrades, synthesises manufacturer specs and independent reviews rather than first-hand lab testing. Core beat: GPU performance across gaming, rendering, and local-LLM inference.

Pros & Cons

Pros

  • ✓ Up to 3000MB/s read over Thunderbolt 3 (40Gbps) - 50GB moves in a minute or less
  • ✓ Dual-mode: runs on Thunderbolt 3 hosts and falls back to USB-C 10Gbps
  • ✓ IP68 dust/water rating plus 4000lb crush and 3m drop resistance
  • ✓ Aluminum core pulls heat off the drive to hold speeds on long transfers
  • ✓ 5-year warranty and 2500MB/s rated write speed for camera-card offloads

Cons

  • ✗ Thunderbolt-class pricing sits well above USB 3.2 portable SSDs at the same 1TB
  • ✗ Listing cites 2700MB/s read sustained, below the 3000MB/s headline figure
  • ✗ USB-C mode caps at 10Gbps, about a quarter of Thunderbolt 3 bandwidth
  • ✗ 3m drop rating is measured on carpeted concrete, not bare hard floors

Manufacturer description

The SanDisk Professional PRO-G40 is a 1TB external SSD built for people who move large files off a camera or a workstation and need the drive to survive the trip. Over Thunderbolt 3 (40Gbps) it reads at up to 3000MB/s and writes at up to 2500MB/s, fast enough to clear a 50GB card dump in a minute or less. SanDisk's own listing copy quotes 2700MB/s read and 1900MB/s write over Thunderbolt 3, so plan around those numbers for long sustained jobs. Plug it into a plain USB-C port instead and it falls back to 10Gbps, which keeps it usable on laptops and tablets that have no Thunderbolt controller…

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SpecPicks Verdict

SpecPicks scored SANDISK Professional 1TB PRO-G40 SSD using a rating × review-volume × price-fit model applied to published specs and reviews across the ssds & storage category. Compare with similarly-priced alternatives in the ssds & storage category before committing. Judge it on the specification table and the price rather than on sentiment: check the figures that decide your use case, then put it side-by-side with two or three close alternatives in the Compare tool before clicking through.

Common buyer scenarios for ssds & 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 retailer's listing before purchase. Prices and stock are set by the retailer and may have moved since this page was last updated.

Frequently Asked Questions

How fast is the SanDisk PRO-G40 in real use?

SanDisk rates it at up to 3000MB/s read and 2500MB/s write over Thunderbolt 3 (40Gbps), enough to move 50GB in a minute or less. The product listing also cites 2700MB/s read and 1900MB/s write as sustained Thunderbolt 3 figures, so expect something in that range on long copies.

Does it work if my laptop has USB-C but not Thunderbolt 3?

Yes. The PRO-G40 is dual-mode and connects over USB-C at 10Gbps when no Thunderbolt 3 port is available. You lose most of the speed advantage at that link rate, but the drive still works normally.

Is the PRO-G40 actually waterproof and drop-proof?

It carries an IP68 dust and water resistance rating, 4000lb crush resistance, and a 3m drop rating. SanDisk notes the drop figure is measured on a carpeted concrete floor, so treat it as protection against accidents rather than a guarantee on any surface.

Does the drive overheat during long transfers?

SanDisk builds the enclosure around an aluminum core that pulls heat away from the internal drive specifically to help maintain transfer speeds. Sustained throughput on very long jobs still depends on your host and ambient conditions.

Key Features

  • Super-fast speeds up to 3000MB/s(1) read and 2500MB/s(1) write with Thunderbolt 3 (40Gbps), capable of moving 50GB in 1 minute or less
  • Dual-mode compatibility with both Thunderbolt 3 (40Gbps) and USB-C (10Gbps)
  • Ultra-rugged design with high-level IP68 dust/water resistance, 4000lb crush resistance, and 3m drop resistance (On a carpeted concrete floor.)
  • Cool aluminum core pulls heat away from the internal drive to help maintain super-fast transfer speeds
  • Pro-grade enclosure for premium strength you can feel

Full Specifications

BrandSanDisk Professional
ColorBlack
Weight4000lb
Model NameSanDisk Professional PRO-G40 SSD
Read Speed2700 megabytes_per_second
Unit Count1 Count
Form Factorportable
Media Speed1900
ConnectivityUSB-C
Model NumberSDPS31H-001T-GBCND
Built-In MediaPRO-G40 SSD, Quick Start Guide, Thunderbolt 3 (40Gbps) Cable
Item Type NameSolid State Drive
Hard-Drive Size1000 GB
Mfr Part NumberSDPS31H-001T-GBCND
Number of Items1
Special FeatureDust Resistant, Portable, Water Resistant
Installation TypeExternal Hard Drive
Compatible DevicesLaptop
Data Transfer Rate2700 megabytes_per_second
Enclosure MaterialInformation Not Available
Full listing titleSANDISK Professional 1TB PRO-G40 SSD - Up to 3000MB/s, Thunderbolt 3 (40Gbps), USB-C (10Gbps), IP68 dust/Water Resistance, External Solid State Drive - SDPS31H-001T-GBCND | Up to 3000MB per S Read, Thunderbolt 3 and USB-C, IP68 Water and Dust, 3m Drop and 4000lb Crush, 5-Yr Warranty

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SANDISK Professional 1TB PRO-G40 SSD - Up to 3000MB/s, Thunderbolt 3 (40Gbps), USB-C (10Gbps), IP68 dust/Water Resistance, External Solid State Drive - SDPS31H-001T-GBCND | Up to 3000MB per S Read, Thunderbolt 3 and USB-C, IP68 Water and Dust, 3m Drop and 4000lb Crush, 5-Yr Warranty is listed on Amazon. Price, availability, shipping and returns are set by Amazon and its sellers — check the listing for current terms. SpecPicks earns a small commission on qualifying purchases — thank you for supporting independent review work.

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SANDISK Professional 1TB PRO-G40 SSD - Up to 3000MB/s, Thunderbolt 3 (40Gbps), USB-C (10Gbps), IP68 dust/Water Resistance, External Solid State Drive - SDPS31H-001T-GBCND | Up to 3000MB per S Read, Thunderbolt 3 and USB-C, IP68 Water and Dust, 3m Drop and 4000lb Crush, 5-Yr Warranty
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