After 30 hours of research and nearly 40 hours of testing, we determined that the 2TB Seagate Backup Plus Slim is our new favorite portable hard drive. It’s slimmer, lighter, and faster than our previous pick, the WD My Passport Ultra. However, you should not buy the 4TB version, also known as the Seagate Backup Plus Fast. Though it may seem like a better value, it’s not as reliable (more on this later).
The 2TB Seagate Backup Plus Slim weighs just 0.33 pounds and is one of the thinnest portable drives out there, measuring .48 inches thick. The Slim also bests our previous pick, the WD My Passport Ultra, in speed, and the drive’s plastic case doesn’t flex or creak under pressure like the WD’s case. The 2TB model is less expensive per terabyte than the 1TB and 500GB models, making it the best value aside from the 4TB Seagate Backup Plus Fast, which you should avoid.
But the WD My Passport Ultra is still a solid alternative should our new pick go out of stock. If you’re in need of a ruggedized drive, our previous recommendation, theSilicon Power Armor A80, is still the best shockproof and waterproof option available. And for professionals or those who know they need a Thunderbolt connection, we still recommend the LaCie Rugged Thunderbolt.
Who should(n’t) buy this
If your external hard drive is just going to sit on your desk all the time and never budge, you’re better off with a desktop external because it’s faster and you can get more storage for less money. For example, our desktop pick—which isn’t the fastest desktop hard drive out there—has faster read and write speeds by about 30 megabytes per second and is about $20 cheaper per terabyte than our portable recommendation at the time of writing.
You’ll be paying more per terabyte and sacrificing some speed, but a portable hard drive can be the perfect backup solution for your laptop.
But if you need an external drive that can be (carefully) tossed in a bag and used on the go, a portable hard drive is just what you’re looking for. You’ll be paying more per terabyte and sacrificing some speed, but a portable hard drive can be the perfect backup solution for your laptop or a way to store photos and other data while traveling or commuting.
Most portable externals use 2.5-inch hard drives, which are powered entirely by the USB or Thunderbolt connection. This means that portable hard drives don’t need an additional power adapter, unlike desktop external drives, and are consequently more convenient to use while traveling. Portable hard drives are usually much smaller and lighter than their desktop counterparts.
However, most portable hard drives have smaller platters and slower rotation speeds, which translates to slower read and write times and longer waits for file transfers. The 2.5-inch HDDs typically found in portable drives currently max out at 2TB, compared to 3.5-inch desktop external drives that go up to 4TB. So if you need more than 2TB, you’ll be stuck buying multiple portable externals versus a single desktop drive. Again, portable hard drives are also generally more expensive per terabyte than desktop options.