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SanDisk Professional PRO-G40 SSD Review: Rugged, Fast, Versatile, and Expensive

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From late 2022 till early 2024, many SanDisk Extreme/Pro and WD My Passport SSD portable drives were reported to wipe off their data randomly. While I didn’t experience that with the drives I’ve used, including those mentioned here, and the situation has seemed to improve, you’re advised to update the firmware to the latest before using them. In any case, never put the only copy of your data on a portable drive.

Per conventional wisdom of portable storage: If you get a Thunderbolt 3 (or 4) drive, it won’t work with USB despite fitting perfectly into a USB-C port.

That changed on October 5, 2022, when the SanDisk Professional PRO-G40 SSD, the latest in Western Digital’s PRO storage lineup, arrived. And the new external storage device proved to be WD’s best portable SSD to date in my testing. It has (almost) everything you’d wanted.

In fact, the PRO-G40 SSD is the answer I’ve been looking for since the Samsung X5 I tested some four years ago.

Here’s the bottom line: If you’re looking for a super-fast portable SSD that can do it all at the current hefty street price of $499.99 for 2TB and $299.99 for 1TB, the new PRO-G40 SSD is still an excellent buy. Get one today!

Dong’s note: I first published this on October 5, 2022, as a news piece and updated it to an in-depth review on December 12 after hands-on performance testing.

SanDisk Professional PRO G40 SSD Has a status light
The new SanDisk Professional PRO-G40 SSD will work with a Mac right out of the box.

SanDisk Professional PRO-G40 SSD: A rugged portable drive that works everywhere

The new PRO-G40 SSD is the latest in Wester Digital’s portable PRO storage for the processional under the SanDisk Professional brand.

As such, the new drive’s design reminds me of the PRO-BLADE Transport. The main difference is that the G40 is a complete portable SSD with faster speeds and versatility.

It’s also compact enough to fit into one’s palm and weighs just a quarter of a pound (120 grams).

The new portable PRO-G40 SSD is rugged and can take some beating. WD says it features IP68 dust/water resistance, up to 4000-pound crush resistance up to 3-meter drop resistance. Consequently can withstand the elements of any working environment.

In my trial, I tossed it a round a few times and left it outside on the lawn under heavy rain overnight, and the drive survived intact.

Rugged design, super-fast speed

On the inside, the new PRO-G40 SSD checks all the boxes for a dream portable drive. Almost.

First, it’s a Thunderbolt 3 drive that can deliver up to 2700MB/s of copy speed. If you have a USB-C port, it also supports USB 3.2 Gen 2 (10Gbps) with up to 1000MB/s performance.

And you can move from one standard to another seamlessly. The only difference is that it performs faster with Thunderbolt 3.

The drive uses a WD_BLACK, a variant of the SN750, as its storage.

SanDisk Professional PRO G40 SSD TopSanDisk Professional PRO G40 SSD Bottom
The top and bottom of the SanDisk Professional PRO-G40 SSD. Rated IP68, the drive is water-resistant and can also handle crushes and drops.

WD PRO-G40 SSD: Hardware specifications

SanDisk Professional PRO-G40 SSD
StandardThunderbolt 3 (40Gbps)
USB 3.2 Gen 2 (10Gbps)
(Will not work with USB-A)
Internal StorageNVMe SSD
CompatibilitymacOS 10.13 and later, 
Windows 10 and later
Default File SystemAPFS (Mac)
and SKUs
Dimensions4.36 x 2.28 x 0.47 in
(111 x 58 x 12 mm)
Weight1TB: 0.27 lbs (121.2 g)
2TB: 0.27 lbs (122.3 g)
Data Transfer Rate
(via Thunderbolt 3)
Thunderbolt 3: Up to 2700MB/s read and 1900MB/s write
USB-C: Up to 1050MB/s read and 1000MB/s write
Operating Temperature41o-95oF | 5o-35oC
RuggednessIP68 dust- and water-resistant
4000 lbs crush resistance
3-m drop resistance
Encryption supportNone
Warranty5 years
US Price
(at review)
$499.99 (2TB)
$299.99 (1TB)
WD PRO-G40 SSD’s hardware specifications

A frill-free plug-and-play portable drive (for Mac users)

As you might have noted from the table above, the PRO-G40 SSD doesn’t have everything one might want from a portable drive.

For example, it doesn’t support hardware encryption or any built-in protection feature—you’ll need third-party software if you want to keep your data safe against prying eyes.

On top of that, its rated performance with USB could be better—it doesn’t support USB 3.2 Gen 2×2 (20Gbps).

Out of the box, the PRO-G40 is formatted with the APFS file system to work with a Mac immediately. Windows users can reformat it into NTFS or the exFAT system if they want to interchangeably use the drive with the two platforms.

While the drives work with any host with a USB-C port, it performs best when used with Thunderbolt 3, which is supported in all new Macs.

And by the way, in my experience, the drive will not work with USB 2.0 or any USB-A port. You must use it with a USB-C (or Thunderbolt) port. That’s not a huge deal unless you want to use it with older computers.

SanDisk Professional PRO-G40 SSD: Detail photos

SanDisk Professional PRO G40 SSD Retail BoxSanDisk Professional PRO G40 SSD out of box
SanDisk Professional PRO G40 SSD’s retail box and what the package includes

SanDisk Professional PRO G40 SSD Port TB3
On one side, the SanDisk Professional PRO G40 SSD has a USB port for both power and data connections. This port supports both Thunderbolt 3 and USB-C.

SanDisk Professional PRO G40 SSD TB3 Cable
The drive includes a short Thunderbolt cable. It’ll also work with any standard USB-C cable.

SanDisk Professional PRO G40 SSD Connected
Here’s the SanDisk Professional PRO G40 SSD in action. Note its little white status light, which flashes to show data activities.

SanDisk Professional PRO G40 SSD vs. G Drive SSD topSanDisk Professional PRO G40 SSD vs. G Drive SSD
Here’s the SanDisk Professional PRO G40 SSD next to WD’s PRO portable SSD, the G-Drive SSD, which doesn’t support Thunderbolt.

SanDisk Professional PRO-G40 SSD: Excellent performance

For this review, I used the new SanDisk Professional PRO-G40 SSD for an extended amount of time and found it quite satisfying. The super-fast speed aside, the fact that I could use it with any USB-C port has made life much easier.

I tested the drive via Thunderbolt 3 and USB 3.2 Gen 2 (10Gbps) ports, and it worked without any issues.

Since most slower USB standards—USB 3.2 Gen 1 (5Gbps) and below—use the USB-A port type, I couldn’t test the PRO-G40 at any lower USB grades.

SanDisk Professional PRO G40 SSD Write PerformanceSanDisk Professional PRO G40 SSD Read Performance
The SanDisk Professional PRO-G40 SSD’s copy performances.

It’s worth noting that the drive can get a bit warm, but it never became hot enough to cause concern. Overall, it proved to be a solid little portable SSD that could.

SanDisk Professional PRO-G40 SSD's Rating

8.3 out of 10
SanDisk Professional PRO G40 SSD box content
9 out of 10
8 out of 10
8 out of 10


Thunderbolt 3 and USB 3.2 Gen 2 support; fast NVMe-based performance

Rugged, water-resistant, compact design

Thunderbolt 3 cables included


Expensive; no USB 3.2 Gen 2×2; only works with USB-C ports

A bit pricey

Reformat required for Windows

Runs a bit warm


The SanDisk Professional PRO-G40 SSD is excellent for anyone who needs a portable SSD that’s rugged, fast, and works across platform and connection standards. Currently, it’s one of a few that can handle both Thunderbolt 3 and USB interchangeably.

In a way, it’s a storage device that helps blur the line between these two connection standards that share the same USB-C port type. And that’s a good thing. The fact it’s also super-fast and rugged doesn’t hurt. Get one today!

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9 thoughts on “SanDisk Professional PRO-G40 SSD Review: Rugged, Fast, Versatile, and Expensive”

  1. Hi Dong,
    two questions:
    1. is this still recommended? seems like more than an year old model.
    2. Does this work with Linux? if i want to make a bootable linux disk with ext4.

    Thank you!

  2. Dong: I just upgraded my MacBook Pro to a new one, which comes with three Thunderbolt 4 ports. As an underwater photographer, I have occasion to upload large image and video files. I also need to store backups on a portable SSD drive.

    Is the SanDisk Professional PRO-G40 my best bet for speed? Or is there a faster portable SSD drive available and optimized for use with Thunderbolt 4?

    Thanks, Mike

  3. “Currently, it’s the only one that can handle both Thunderbolt 3 and USB interchangeably.” – Envoy Pro FX does too. From the OWC page “Thunderbolt 3 : Up to 40 Gb/s (or 5000 MB/s)
    USB 3.2 Gen 2 : Up to 10 Gb/s (or 1250 MB/s)”.

    • Thanks, Scott. The review actually went live by accident before I finished with it. I completed it just now with performance charts etc. By the way, at the time of my review, the Envoy Pro FX did NOT support USB.


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