SanDisk Extreme Pro Portable SSD review: Fast, tough and reasonably priced

The IP55 rating means it can fend off water and dust.

sandisk extreme pro portable ssd

Today's Best Tech Deals

Picked by PCWorld's Editors

Top Deals On Great Products

Picked by Techconnect's Editors

At a Glance
  • SanDisk Extreme Pro Portable SSD

Well, that didn’t take long. A few short weeks after reviewing the Samsung T7, SanDisk’s Extreme Portable Pro SSD (1TB) showed up at our door and easily surpassed its rival for the top-performing USB 3.1 Gen 2 drive. SanDisk’s drive doesn’t offer the T7’s handy and fun fingerprint security, but it’s about the same price and offers software-based password protection if security is a concern. 

This review is part of our ongoing roundup of the best external drives. Go there for information on competing products and how we tested them. 

Design and features

The Extreme Pro Portable SSD is a bit larger than the previous iteration, measuring approximately 0.4 x 2.25 x 4.34 inches, but it’s still compact enough to reside comfortably in a shirt pocket. Unlike the Samsung T7 competition, there’s an attachment point (a very large one!) for a lanyard or key ring. 

The Extreme Pro Portable is designed with an aluminum chassis and ABS top, and is IP55-rated (Ingress Protection), meaning it will fend off dust and low-pressure water. The ingress weak spot with storage devices has historically been the connection port, but Type-C ports, such as the one on the Extreme Pro, are far better sealed than previous types.

Note that the IP rating indicates survivability when disconnected. With electricity flowing through a cable connection, fluid can short cable pins, causing electronic damage.

en us extreme pro portable ssd angle left hr Sandisk

SanDisk’s Extreme Pro Portable SSD has an aluminum (the orange parts) chassis with a dimpled ABS cover.

The Extreme Pro Portable SSD lacks the fingerprint reader that graces the Samsung T7; however, it does come with SanDisk’s own SecureAccess software security solution. It provides password protection for the drive’s 256-bit AES encryption (when enabled), though it must, of course, be installed on any device or PC from which you wish to access your data—not as convenient. Neither drive is FIPS 140-2 certified (Federal Information Processing Standards security), which will limit enterprise interest and rule it out for conforming government agencies. 

Why is the Extreme Pro Portable so fast? While it does transfer data via speedy USB 3.1 Gen 2 (10 gigabits per second), it's likely far more important that the internal storage uses the NVMe communications standard, instead of the slower SATA standard used by its Extreme Portable SSD predecessor. Beyond that, SanDisk offered no details, and I didn’t want to destroy the drive to find out what’s inside.

The WD store (SanDisk’s parent company) sells the Extreme Pro Portable in three sizes: 500GB for $120 currently, 1TB for $230 currently (the size we tested), and 2TB for $430 currently. We found the same prices on major online sites: 500GB for $120 on Amazon and 1TB for $230 on Amazon. The five-year warranty is in effect no matter where you buy. 


SanDisk squeezed a lot more performance across the board from the Pro version, so much so that it’s the fastest USB SSD that we’ve see to date. Burst performance is roughly on a par with the Samsung T7’s, but it blows that drive out of the water during long writes. All the results shown below are from the 1TB version SanDisk sent us.

cdm 6 sandisk extreme pro portable IDG

In CrystalDiskMark, the Extreme Pro was rated as far faster than its predecessor and Samsung's T5, but only marginaly faster than Samsung’s newer T7. Longer bars are better. Note that this chart was corrected after initial publishing to show the T5's true, and lesser performance.

CrystalDiskMark 6 rated the Extreme Pro and Samsung T7 drives nearly equal, but as I just noted, real-world testing revealed a distinct advantage for the Extreme Pro during long writes. In the 48GB write tests shown below, this sway was apparent...

48gb copies IDG

Though it was slightly slower than Samsung T7’s reading, the Extreme Pro Portable blasted its rival when it came to writing. Shorter bars are better.

Those are eye-opening results, however, check out the 450GB write numbers below, where the advantage became overwhelming. 

450gb write sandisk extreme pro portable IDG

The Pro version of the Extreme Portable rules when it comes to long sustained writes. No other USB SSD we’ve tested even comes close. Shorter bars are better.

The primary reason for the landslide victory was that the Extreme Pro Portable wrote at a relatively steady 600MBps or so, while the T7 started at over 500MBps and dropped to around 300MBps when it ran out of cache. That occurred at around 4 percent of total capacity, or the 20GB mark with the 500GB T7 we tested. More capacious models of the T7 will run out of cache later in the process, narrowing but not eliminating the margin of defeat. 

The Samsung T7 is a slightly faster reader, but being a distant second writing really hurt its conglomerate score in the 48GB tests. How much the slow writing will affect you depends on how you use your drive. For small amounts of data, the difference won’t tell. However, the time you’ll save on writes with the Extreme Pro Portable will tell over the long haul. 

Testing is performed on Windows 10, 64-bit running on a Core i7-5820K/Asus X99 Deluxe system with four 16GB Kingston 2666MHz DDR4 modules, a Zotac (NVidia) GT 710 1GB x2 PCIe graphics card, and an Asmedia ASM2142 USB 3.1 Gen 2 (10Gbps) card. Also on board are a Gigabyte GC-Alpine Thunderbolt 3 card and Softperfect’s Ramdisk 3.4.6, which is used for the 48GB read and write tests.

It’s the winner

The Sandisk Extreme Pro Portable SSD is faster and only a bit larger that the Samsung T7. I admit that I enjoy the Samsung T7’s fingerprint swiper, but otherwise, the Sandisk Extreme Portable Pro is the portable USB SSD you want when you’re dealing with large amounts of data.  

This article was edited on 2/27/2020 to correct the discussion and chart for CrystalDiskMark which showed the Samsung T5 as being much faster than it actually is.

Note: When you purchase something after clicking links in our articles, we may earn a small commission. Read our affiliate link policy for more details.
At a Glance
  • The SanDisk Extreme Pro Portable SSD is the fastest writer we've seen by far. It's IP55-rated to fend off dust and water, affordable for its ilk, and we even like the looks. Unless you want the fingerprint security offered by its Samsung T7 rival, this is the drive.


    • Overall fastest USB SSD currently available
    • Relatively affordable
    • IP55 rated against dust and mild streams of water


    • Slightly slower reading files than Samsung's T7
Shop Tech Products at Amazon