Do photographers need the fastest external SSD? We tested three to find out

We put the USB 3.2 Gen 2 Samsung T7 Shield, USB4 SanDisk Extreme Pro and Thunderbolt 5 OWC Envoy Ultra head-to-head. Photo: Mitchell Clark

These days, there are an overwhelming number of options when it comes to buying an external SSD to expand your computer's storage (an increasingly important ability as Raw sizes and video bitrates balloon). The highest-end options use protocols like Thunderbolt 5 or USB4 to achieve blistering speeds, but this raises the question: do photographers need all that performance?

We tested several SSDs across a range of price points to see if each one had more to offer for photographers, or if the returns quickly diminished.

What we tested and how we tested them

For this article, we used a 1TB Samsung T7 Shield as our sample for USB 3.2 Gen 2, a 2TB SanDisk Extreme Pro to represent USB4 and a Thunderbolt 5 2TB OWC Envoy Ultra. The tests were carried out on a 2024 MacBook Pro with an M4 Pro processor, which supports Thunderbolt 5, and we tested each SSD one at a time, using the cable it came with.

While this isn't meant to act as a review for the specific SSDs we used for our testing, the results can't necessarily be universally applied to each product in their class. For example, the USB4 SanDisk SSD is using the faster 40Gbps version of the spec, but another USB4 SSD may only be able to reach 20Gbps speeds. We may also see faster USB 4 and Thunderbolt 5 drives as the market around those specifications matures, but, as of early 2026, the drives we've tested are some of the best in their respective classes.

How do the drives stack up?

USB 3.2 Gen 2

The magic of USB-C: it can be used for almost anything. The downside of USB-C: it can run at almost any speed.

Starting with our standard-bearer for USB 3.2 Gen 2, the Samsung T7 Shield handled a number of photography-related tasks with aplomb. We didn't notice any hiccups scrolling through a Lightroom Classic library with over 3600 images, and it wasn't meaningfully slower than the competition when we were copying hundreds of Raw/JPEG pairs to it from a CFExpress or SD card. However, it did take noticeably longer to import and build previews for that Lightroom library, and copying files to the drive from the computer (and vice versa) could take several times longer than on our faster drives.

For the photographers who occasionally stumble into the land of video, we also found that the slower SSD struggled a bit more when editing footage off of it. Adobe Premiere would frequently drop frames during playback, and more complex sequences could slow it to a crawl. Final Cut fared a bit better and was surprisingly usable, though there were still occasional hitches.

USB4

Despite the USB 3.2 Gen 2 drive's general competence, there were definitely times when the USB4 drive made it obvious that it was using a next-generation interface capable of real-world read and write speeds anywhere from 2.5 to 6.4 times faster than those of the Samsung model. Moving files back and forth between it and the computer was very quick, and most of the playback issues in our video editing suites disappeared or were substantially less noticeable. And, of course, it handled all our photo editing and organization tasks with the same ease as the lower-end model.

Thunderbolt 5

The point of the Thunderbolt spec is to be an assurance of performance; USB4 may just be Thunderbolt 4 in a trenchcoat, but until you do some digging, you won't know exactly what speeds a piece of USB4 gear can deliver. That's not the case with Thunderbolt.

Unsurprisingly, the Thunderbolt 5 drive easily handled everything we threw at it, and it never felt like it was a performance bottleneck. However, there also weren't any scenarios we ran into where it was noticeably faster than the USB4 drive, outside of our synthetic benchmarks*. While there are probably some users who'd be able to push it to its limits, we suspect most photographers and video editors wouldn't see a ton of benefit over a good USB4 drive.

* - And even there, the gains weren't nearly as large a jump as the one from USB 3.2 Gen 2 to USB4; our Thunderbolt 5 drive ran around 1.2 to 1.8 times faster than our USB4 one, not quite realizing the theoretical 2x improvement that the standard would allow for.

What's in a name?

No discussion of external SSDs would be complete without a rant on just how confusing things have become when it comes to USB ratings and speeds. What was once relatively simple (USB 2 = slow, USB 3 = fast) has become incredibly complex, with the version of USB that your device supports actually telling you very little about what speeds it supports. For example, a device labeled "USB 3.2" may only run at 5Gbps, or it could rival earlier versions of Thunderbolt, supporting up to 20Gbps. USB4 has the same issue, with potential speeds ranging from 10Gbps to 120Gbps.

Wikipedia has an excellent chart showing all the permutations of the USB specification and the speeds they provide. Which explains a bit why the standard is such a nightmare for those who care about performance. Graphic: Wikipedia

While external SSDs usually come with maximum speed ratings that tell you what they should be capable of (even the fastest SSDs won't be capable of fully saturating USB4's top speeds), it's more of a concern when it comes to the port on your computer and the cable you use to connect the two. While the USB Implementers Forum has been leaning on people to label equipment with their speed and power delivery ratings, not everyone will, so you'll want to make sure you're familiar with which ports on your computer are the fastest, and that you're using a high-quality cable that's capable of providing the speeds your SSD needs. If you have a random USB-C to C cable laying around your house that came with some device, assume it runs at USB 2 speeds, and shouldn't be used for transferring data.

The cable that comes with the SanDisk is, thankfully, labeled with the speeds and power delivery that it's capable of, but this is currently far from the norm. Photo: Mitchell Clark

Thankfully, the story is simpler with Thunderbolt, as each generation has only a single speed. If you have a Thunderbolt 4 cable, you know it should run at 40 Gbps. Of course, this is part of the reason why the price floor for Thunderbolt devices and accessories is so much higher than it is for their USB counterparts. It's also worth noting that Thunderbolt is cross-compatible with USB; if you plug a Thunderbolt drive into a 20Gbps USB-C port on your computer, it will still work, albeit at the lower speeds allowed by the connection.

Summary

This isn't a review of the OWC Envoy Ultra, but it's been a very enjoyable drive to use. The attached cable may be a bit of a mixed bag in terms of repairability but means you can never accidentally leave it at home.

For most photography tasks, you can get away with a relatively standard USB 3.2 SSD with a port and cable rated for 10Gbps speeds. If you frequently move around large chunks of data, edit complex videos, or are just generally impatient, though, it may be worth upgrading to a faster USB4 one, with the greatest gains to be had by going with a model that supports a 40Gbps connection. Most photographers and videographers will be able to stop there; unless you just enjoy having the best version of a thing possible, or need a specific feature, capacity or form factor only offered by a Thunderbolt drive,