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Whether you want to back up the data on your PC, transfer videos from your Mac or offload a few games from your PlayStation 5, a portable SSD is a quick and easy way to expand your storage. These little bricks may cost more than traditional hard drives, but they’re significantly faster, lighter and more reliable. Figuring out the best portable SSD for you, though, isn’t as simple as just picking the one with the lowest price or the most space. (Well, it can be, but that wouldn’t be very efficient.) To help, we’ve weeded through the portable SSD market, tested a bunch of contenders and sorted out which ones offer the most value. You can find our top picks below, plus an overview of what to know before you buy.

Table of contents

Best external SSDs for 2025

Other external SSDs we tested

The pre-built OWC Express 1M2 is a premium-feeling USB4 SSD that’s roughly as fast as the ADATA SE920, but it’s larger and significantly more expensive as of this writing.

If you’re in the relatively small group with a PC that supports USB 3.2 Gen 2×2 but not Thunderbolt or USB4, the Crucial X10 Pro is essentially a faster version of our top pick. The Lexar SL600 is a larger but slightly quicker option, while the Lexar SL500, Kingston XS2000 or Samsung T9 could also work if you see them on discount. As a reminder, though, drives like these are aimed primarily at content creators and other professionals, and you have to make sure you won’t upgrade to a device with a faster USB interface anytime soon.

The Samsung T7 Shield has a conveniently rugged design with a rubberized, IP65-rated shell. It also comes with both USB-C and USB-A cables. But it was consistently slower than the X9 Pro and XS1000 in our benchmark tests, plus it has a shorter three-year warranty.

The Silicon Power PX10 is an especially affordable USB 3.2 Gen 2 model. Its peak speeds weren’t too far off the X9 Pro or XS1000 in synthetic benchmarks, but it can get distractingly hot and its sustained writes are markedly worse. It took 50 seconds longer to move our 70GB custom test folder to this drive compared to the X9 Pro, for example.

The Crucial X6 is another low-cost option that’s a good bit slower than our top picks. It’s limited to a three-year warranty and lacks an IP rating as well. It’s not a terrible option for the basics, but there’s little reason to get it over the XS1000 when their prices are similar.

The OWC Envoy Pro FX is well-built and supports Thunderbolt 3 and USB 3.2 Gen 2, but it’s a smidge slower than the SE920 and Express 1M2, and it’s much pricier than the former.

What to consider before buying an external SSD

Capacity

The first thing to figure out before buying a portable SSD is just how much storage space you need. Most of the drives we considered for this guide are available in capacities ranging from one to four terabytes, though plenty of smaller and larger options exist.

There’s no hard-and-fast rule for which size is “best” — that’ll ultimately depend on your budget and what exactly you’re looking to stash. But in general, it’s better to overcompensate than underdo it. Nobody wants to be forced into buying a second drive because they filled the first one up too quickly. If you’re backing up a PC, a good rule of thumb is to buy an external SSD with twice as much space as your computer’s internal storage. This way, you can save at least one full backup while also having room for additional data. If you want to store a bunch of PlayStation or Xbox games with huge install sizes, you may need more space. If you just want to back up a small collection of files, you may be better off saving your cash and just getting a smaller USB flash drive instead, which aren’t quite the same as the external SSDs we tested for this guide.

Price

In general, you get a better price-per-gigabyte ratio the further you go up the capacity ladder. As of this writing, the 1TB Samsung T9 is priced at $130, or $0.13 per gigabyte (GB), while the 4TB version is available for $297 or $0.07 per GB. That technically makes the larger model a better “value,” but not everyone needs to pay that much more upfront.

SSDs in the same speed class tend to not vary too wildly in terms of performance, so part of our decision-making for this guide came down to which ones are often the cheapest. But prices can fluctuate over time; if you see that one of our top picks is priced way higher than a comparable honorable mention, feel free to get the latter. At this point in time, costs are broadly trending upwards.

Speed and USB interface

Just about all external SSDs are significantly faster than mechanical hard disk drives (HDDs), so you’ll save time waiting for files to transfer and games to load no matter what. Within the market, however, there are distinct performance tiers. These are defined in large part by the USB interface a drive supports. While all of the SSDs we considered for this guide can connect over USB-C, some USB-C connections can supply faster transfer speeds than others. Sorting through this can get real confusing real fast, so we’ll try to put it in simple terms.

You can essentially divide today’s crop of portable SSDs into different segments. At the very top are drives that utilize the (relatively) new Thunderbolt 5 standard, which has a theoretical maximum transfer rate of 80 gigabits per second (Gbps). (You may see it advertise speeds up to 120 Gbps, but that boost doesn’t apply to storage devices.) But portable SSDs that support this tech only just started to trickle out toward the end of 2024, and the market for devices with Thunderbolt 5 ports is still fairly limited, with the most notable exceptions being Apple’s top-end Macs with a M4 Pro or M4 Max chip.

Thunderbolt 5 is built on a spec called USB4, which can technically reach up to 80 Gbps as well but is more typically available in a flavor that tops out at 40 Gbps. Portable SSDs based on that standard started to roll out toward the end of 2023 but are still relatively infrequent. The older Thunderbolt 3 and Thunderbolt 4, which other high-end external SSDs continue to use, support the same 40 Gbps maximum.

A third version of USB4, meanwhile, maxes at 20 Gbps, as does an older yet more frequently used standard called USB 3.2 Gen 2×2. Below that is USB 3.2 Gen 2, which maxes at 10 Gbps. Then there’s USB 3.2 Gen 1, which is capped at 5 Gbps. Lastly, we’ll bundle together SSDs that use older standards and aren’t worth considering here.

To make this easy: For everyday folks, a good USB 3.2 Gen 2 drive is the sweet spot between fast-enough performance, wide-enough compatibility and cheap-enough price, so those make up our primary recommendations above. If you work in a creative field or don’t mind paying extra to shave seconds off your large file transfers, though, a “higher-tier” model would make sense. However, note that actual computers that utilize USB 3.2 Gen 2×2 aren’t super common — no Mac supports it, for one — and the interface is effectively being replaced by USB4.

In general, your chain is only as strong as its weakest link: If your computer only has USB 3.2 Gen 2 ports, for example, you could still use a Thunderbolt SSD, but you won’t get beyond Gen 2 speeds. Make sure you know what you’re working with before you buy.

As a refresher, storage devices are broadly measured in terms of read and write speeds. The former refers to how long it takes to access something from the drive; the latter, how long it takes to save something to it. From there, you can break these metrics into sequential and random performance. Sequential speeds tend to matter more with portable SSDs, since most people use them to save or access long, constant streams of data such as a bunch of high-res photos. Random speeds would be important if you want to run video games off the drive, since that’d involve reading and writing smaller, more scattered files. Either way, how well an SSD can sustain its performance with extended use is also critical.

Other performance factors and enclosures

A modern portable SSD’s speeds aren’t just about its USB interface, though. Its performance can also depend on how advanced its controller is, whether it has a native USB flash controller or a separate bridge chip to communicate with a host device, the kind and quality of NAND flash memory it uses, whether it has a DRAM cache or it’s DRAM-less, and more.

We’re simplifying things, but here are some quick tips: Drives with triple-level cell (TLC) memory aren’t as cheap as quad-level cell (QLC) SSDs, but they’re generally more reliable and they offer better write performance. Having a dedicated DRAM cache helps if you plan to hit your drive with more intense, sustained workloads, but may not be worth the extra cost for most people. Some models with native flash controllers may not perform as well as those with a bridging chip, depending on the SSD inside, but they typically draw less heat and are physically smaller. All of this is to say that an external SSD’s speeds aren’t quite as straightforward as what the manufacturer chooses to advertise on the box.

It’s also worth remembering that you can turn an internal SSD into a portable solution with a good enclosure. If you have a spare drive and don’t mind going the DIY route, this can be a cheaper and more flexible solution, though we’ve stuck to pre-built models for this guide for the sake of simplicity.

Size, durability, endurance and warranty

Most portable SSDs are impressively small and light, so they won’t be difficult to tuck in a bag (or even a pocket) and take on the go. We note above if any drive is bulkier than usual.

Nothing we’re talking about matters if your drive can’t last in the long term. It’s hard to definitively say which external SSDs are the most reliable, but we scoured through user reviews and feedback while researching this guide to ensure none of our picks show a pattern of catastrophic errors. If there was too much smoke around a particular model, we steered clear. We ruled out certain drives from SanDisk and Western Digital, for instance, after reports from Ars Technica and The Verge noted an issue that led to data loss (and lawsuits) in 2023.

That said, one of the big reasons you’d buy an SSD in general is its superior durability. Because it has no moving mechanical parts inside, an SSD has far fewer avenues to failure than an external hard drive. You still don’t want to be careless with them, but an accidental drop shouldn’t be the end of the world.

Some portable SSDs build on this inherent ruggedness with plastic or rubberized casings and more robust waterproofing. These aren’t necessary for everyone, but if you’re a frequent traveler or someone who often works outdoors, there are options for you.

Still, all drives can fail. If you have any sort of data you’d be distraught to lose, you should back it up regularly, then make a second backup, ideally with a cloud service. Along those protective lines, we also took note of the warranty policy for each drive we tested. Just about all of them are backed for either three or five years; of course, longer is better.

Encryption and software

It’s not uncommon to store sensitive data on a portable SSD, so some models offer extra security features like hardware-based encryption — i.e., direct scrambling of data stored on the drive itself — built-in keypads and fingerprint readers to protect against unauthorized access if the drive is lost or stolen. While not top requirements, perks like these are certainly good to have. Some SSDs also come with companion software to further manage the drive. The best of those can be handy to have around, but we wouldn’t call them essential.

How we test external SSDs

Unfortunately, we did not have access to a device that can make full use of USB 3.2 Gen 2, USB 3.2 Gen 2×2 and Thunderbolt/USB4 speeds interchangeably, so we had to split our testing across multiple devices, including an M1 Pro MacBook Pro and an Alienware gaming PC running Windows 11. Because of this, we primarily compared the portable SSDs within each “class” against one another. Before switching OSes, we reformatted each drive to each platform’s standard file system format: APFS for macOS and NTFS for Windows.

After researching which SSDs had enough positive feedback to be worth testing in the first place, we put 13 drives through a range of synthetic and “real-world” benchmark tests. On Windows, these included CrystalDiskMark, PCMark 10’s Data Drive Benchmark and 3DMark’s gaming-focused Storage Benchmark. On macOS, we used AmorphousDiskMark (effectively a Mac version of CrystalDiskMark), BlackMagic Disk Speed Test and ATTO Disk Benchmark.

We also timed how long it took for each drive to read and write a custom 70GB folder filled with roughly 11,500 different files, including photos, videos, music files, PDFs and other large and small data types scattered across numerous subfolders. We performed multiple passes for each test to avoid irregularities, and we kept track of each SSD’s heat levels over the course of the whole suite. Our process wasn’t a perfect science, but it gave us a general sense of how each drive compares to other models in its price and performance range.

Recent updates

February 2025: We’ve checked to ensure the pricing info and links in this guide are still accurate. We’ve also added details on the (relatively) new Thunderbolt 5 interface, which has been implemented in a couple recent portable SSDs like the OWC Envoy Ultra and LaCie Rugged SSD Pro5. We’ll look to include testing notes for those for our next update, as they should be faster than the ADATA SE920, our current premium pick, albeit for a much higher price. For now, though, our top picks remain the same.

October 2024: We’ve taken a sweep through this guide to ensure all pricing and availability info is still correct. Our recommendations are unchanged.