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SANDISK Professional 4TB PRO-G40 SSD - Up to 3000MB/s, Thunderbolt 3 (40Gbps), USB-C (10Gbps), IP68 dust/Water Resistance, External Solid State Drive - SDPS31H-004T-GBCND | Up to 3000MB/s, Thunderbolt 3 (40Gbps), USB-C (10Gbps), IP68 dust/Water Resistance, SDPS31H-004T-GBCND

SANDISK Professional 4TB PRO-G40 SSD (SDPS31H-004T-GBCND)

Bottom line: The SANDISK Professional 4TB PRO-G40 SSD: Up to 3000MB/s read, 2500MB/s write over Thunderbolt 3 (40Gbps); main trade-off: USB-C mode caps at 10Gbps, far below the Thunderbolt 3 ceiling.

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

Mike Perry — Hardware researcher since 2014. For external drives and portable storage, 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, 2500MB/s write over Thunderbolt 3 (40Gbps)
  • ✓ Moves roughly 50GB in a minute or less
  • ✓ Dual-mode: works over Thunderbolt 3 and USB-C (10Gbps)
  • ✓ IP68 dust/water rating plus 4000lb crush and 3m drop resistance
  • ✓ Aluminum core pulls heat away to hold speeds on long transfers

Cons

  • ✗ USB-C mode caps at 10Gbps, far below the Thunderbolt 3 ceiling
  • ✗ Ships APFS-formatted for Mac; Windows users must reformat
  • ✗ 4TB capacity carries a steep per-terabyte cost
  • ✗ Aluminum enclosure adds bulk versus plastic-shell portable SSDs

Manufacturer description

The SanDisk Professional PRO-G40 SSD is a 4TB portable drive built for creators who move large media files under deadline. Over Thunderbolt 3 (40Gbps) it sustains read speeds up to 3000MB/s and writes up to 2500MB/s, enough to move roughly 50GB in a minute or less, so multi-cam 4K and 8K footage offloads while you set up the next shot. A second USB-C (10Gbps) mode keeps the same PRO-G40 SSD working with laptops and tablets that lack a Thunderbolt port, so one drive travels across your whole kit. Durability is the other half of the pitch. The pro-grade aluminum enclosure carries an IP68 dust…

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SpecPicks Verdict

SpecPicks scored SANDISK Professional 4TB PRO-G40 SSD using a rating × review-volume × price-fit model applied to published specs and reviews across the external storage category. Compare with similarly-priced alternatives in the external 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 external 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 4TB in real use?

Over Thunderbolt 3 (40Gbps) it reaches up to 3000MB/s read and 2500MB/s write, which SanDisk rates as moving 50GB in a minute or less. On a USB-C host it runs at the slower 10Gbps interface speed.

Does the PRO-G40 work with Windows PCs, not just Macs?

Yes. It supports both Thunderbolt 3 and USB-C (10Gbps), so it connects to Windows laptops and desktops. The drive ships Mac ready in APFS format, so you will need to reformat it to NTFS or exFAT for Windows use.

How rugged is this drive for location shoots?

It carries an IP68 dust and water resistance rating, 4000lb crush resistance, and 3m drop resistance onto a carpeted concrete floor, inside a pro-grade aluminum enclosure.

Does it get hot during long file transfers?

The enclosure uses an aluminum core that pulls heat away from the internal drive, which SanDisk says helps maintain the drive's top transfer speeds through sustained copies rather than throttling partway through.

What warranty comes with the PRO-G40 SSD?

Warranty terms are not listed in this product's specifications. Check the current Amazon listing or SanDisk Professional's support page for the coverage period that applies to model SDPS31H-004T-GBCND.

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
  • Drive Format: Mac ready (APFS)

Full Specifications

BrandSanDisk Professional
ColorInformation Not Available
Weight4000lb
Model NameSanDisk Professional PRO-G40 SSD
Read Speed3000 megabytes_per_second
Unit Count1 Count
Form FactorPortable
Media Speed2500
ConnectivityUSB-C
Drive FormatMac ready (APFS)
Model NumberSDPS31H-004T-GBCND
CompatibilityMac
Built-In MediaPRO-G40 SSD, Quick Start Guide, Thunderbolt 3 (40Gbps) Cable
Hard-Drive Size4 TB
Mfr Part NumberSDPS31H-004T-GBCND
Number of Items1
Special FeatureDust Resistant, Portable, Water Resistant
Hardware PlatformMac, PC
Installation TypeExternal Hard Drive
Compatible DevicesMac, PC
Full listing titleSANDISK Professional 4TB PRO-G40 SSD - Up to 3000MB/s, Thunderbolt 3 (40Gbps), USB-C (10Gbps), IP68 dust/Water Resistance, External Solid State Drive - SDPS31H-004T-GBCND | Up to 3000MB/s, Thunderbolt 3 (40Gbps), USB-C (10Gbps), IP68 dust/Water Resistance, SDPS31H-004T-GBCND

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SANDISK Professional 4TB PRO-G40 SSD - Up to 3000MB/s, Thunderbolt 3 (40Gbps), USB-C (10Gbps), IP68 dust/Water Resistance, External Solid State Drive - SDPS31H-004T-GBCND | Up to 3000MB/s, Thunderbolt 3 (40Gbps), USB-C (10Gbps), IP68 dust/Water Resistance, SDPS31H-004T-GBCND 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 4TB PRO-G40 SSD - Up to 3000MB/s, Thunderbolt 3 (40Gbps), USB-C (10Gbps), IP68 dust/Water Resistance, External Solid State Drive - SDPS31H-004T-GBCND | Up to 3000MB/s, Thunderbolt 3 (40Gbps), USB-C (10Gbps), IP68 dust/Water Resistance, SDPS31H-004T-GBCND
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