Hey! About the SanDisk PRO-G40 SSD, it does a great job working with both Thunderbolt and USB-C connections. According to the manufacturer's info and what we've found, it's compatible with Thunderbolt 3/4 as well as USB-C.
When you use it with Thunderbolt 3, you'll notice it really shines. The manufacturer claims it can reach read speeds up to 3000 MB/s and write speeds up to 2500 MB/s, which makes it ideal for stuff like video editing or handling big file transfers.
It takes advantage of the 40 Gbps bandwidth that Thunderbolt 3/4 offers to speed up those large data transfers.
Now, even though Thunderbolt is its strong suit, the SSD also does a pretty solid job with USB-C. It's not quite as fast as Thunderbolt, but still good for most people who prefer or need this connection.
The SSD operates at USB 10 Gbps, and from what we've gathered in our research, you might see read speeds around 2480 MB/s and writes close to 2400 MB/s, which is impressive for USB-C.
A heads-up: the quality of the cable can make a difference. Some folks found the cable that comes with it to be a bit iffy, which might cause connection issues or affect performance.
You might want to consider getting a reliable third-party Thunderbolt cable to make sure you're getting the most out of your SSD.
In short, if you're looking for a fast and durable external SSD that works with both Thunderbolt and USB-C, the SanDisk PRO-G40 is a solid pick. Just make sure you've got a good cable to ensure optimal performance.
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How we researched this
Where this comes from: this answer draws on the product's published specifications and the reviews ShopSavvy collected for it, alongside prices from 1 retailer in ShopSavvy's price data, most recently seen May 1, 2025.
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