If you use a PC, chances are you have data stored on it that you don’t want to lose. One of the best ways to make sure your data isn’t lost is to save a copy onto an external drive. It’s an inexpensive and handy way to back up your important files or store any overflow. It can also be a convenient way to transport or transfer files between your devices.

You will almost always have the need for more storage as data files continue to get larger and you accumulate more of them. An external drive is one of the best ways to cover yourself in case of an emergency. We’ve tested numerous external drives and curated the best picks below. We’ve included external drives with blazing-fast performance as well as a pick for best budget option, best portable SSD, and everything in between. Below our recommendations you’ll find additional helpful information on what you need to know to choose the best external drive for your needs.

What you need to know before you buy

Capacity and price

For most consumers, the main shopping concerns for external storage are capacity and price. However, while you might think that the lowest-cost drive provides the most value, it often doesn’t. In fact, dollar for dollar, cheaper low-capacity drives are most often the worst deal historically. We’ve been doing this comparison for years and it’s always been the worst value.

You can see that below where we compare the popular WD Elements desktop hard drive’s available capacities and prices. You’re paying more than twice as much for the lowest-capacity drive versus the next step up. It’s almost equally as bad on the WD Elements Portable drive.

How much capacity do you need?

The best “value” are typically for the largest hard drives as you can see, but it brings considerably higher prices and not everyone needs that much capacity. So how much do you need? We recommend a backup drive at least twice as large as the total capacity of your PC. If you have 1TB of storage in your PC, 2TB will allow you to make a full backup while keeping historical backups on the same drive. Having more storage allows you to keep more historical files should you need them or use the same drive to backup additional PCs.

While the desktop drive provides a far higher capacity, they also require more cables, weigh more, and generally may not be quite as shock resistant as a portable hard drive that’s designed to take a few more bumps, even when on.

Interface

The vast majority of external drives today are USB drives. Beyond that simple statement, the story gets confusing—largely because of the plethora of variations: USB 3.0, USB 3.1 Gen 1 (5Gbps, which is basically USB 3.0), USB 3.2 Gen 2 (10Gbps), and USB 3.2 Gen 2×2 (20Gbps), and now the up-and-coming USB4. In an attempt to simplify things, the USB Forum has recently changed the nomenclature to indicate throughput speed—SuperSpeed USB 5Gbps, SuperSpeed USB 10Gbps, and SuperSpeed USB 20Gbps—because performance is a priority for most uses. For the sake of brevity (and sanity), we generally shorten those names to USB 10Gbps, or 10Gbps USB, for instance.

No hard drive, unless combined in RAID with others, can outstrip the 5Gbps (roughly 500MBps real-world after overhead) throughput of USB 3.1 Gen 1. Don’t worry about Gen 2, 10Gbps, or Thunderbolt with single hard drive enclosures because it doesn’t really matter.

Where SuperSpeed 10Gbps/20Gbps, USB4, or Thunderbolt will definitely help is with the aforementioned RAID hard drive setups, or more likely—an SSD. The good news is that while USB 3.1 Gen 2, which is more than fast enough for most users at 10Gbps, used to be expensive, it’s basically the standard today. A SanDisk Extreme Portable SSD, our runner-up for portable storage, can be had for $90 in a 500GB capacity.

The faster USB 3.2 SuperSpeed 20Gbps (Gen 2×2) moves you into a higher-price bracket, with the Seagate Firecuda Gaming SSD costing $200 for the same 500GB of storage. Although faster than the typical USB 3.2 SuperSpeed 10Gbps, there aren’t a lot of USB 20Gbps gen 2×2 ports out there, but these drives should work with the upcoming USB4 at the same 20Gbps pace.

Thunderbolt 3 and the newer Thunderbolt 4 typically are the highest-performing interfaces for external storage, with the key limitation being a premium price and a general lack of compatibility with the far more popular USB 3.2 ports in the world. Still, if you want the most performance, you can get it in drives such as our recommended portable, the Samsung Portable SSD X5, which is $200 for 500GB of capacity. For comparison, a slower 1TB Samsung T5 on USB is only $125.

Ports

External drives come with a variety of ports, though they’re gradually consolidating on the Type-C connector. Here’s what you need to care about:

USB 3 Micro-B Superspeed. This is still a very common port on many lower-cost portable and desktop external hard drives today. It’s actually the same Micro USB port used on your phone, but beefed up with more data lines to hit USB 3.0 speeds. It’ll do 5Gbps and is fine for hard drives and SATA (internally) SSDs. 

USB 3 Type-B is the larger, blocky version of USB 3.0 Micro B. Type B ports are becoming rare, though you might find one on enclosures supporting 5.25-inch hard drives or optical drives. It supports speeds up to 5Gbps. 

USB-C is the latest of the USB connectors the world is coalescing around. You see it in everything from phones to laptops. Keep in mind, USB-C refers only to the connector itself. What is carried over the wires varies greatly. For example, for data transfers from an external drive, a USB-C port could mean everything from USB 2.0 High Speed (480Mbps) to USB 3.2 SuperSpeed 20Gbps as well as USB4 and Thunderbolt 3. Any higher performance port today should be USB-C—just remember that just because it’s USB-C doesn’t mean the actual electronics inside the PC or drive can hit the highest speeds of what a USB-C port can do.

USB Type-A You won’t find this port on any drive, but you will find this familiar rectangular port on PCs and laptops. The reason we mention it is that any drive with a Type-C port should come with a Type-C to Type-A cable or adapter, hopefully, since most PCs have those.

Thunderbolt 2 is at this point, a dead port. Using the mini-DisplayPort connector, it only really gained popularity on Macs, and even Apple put it out to pasture in 2017. There’s no need to invest in a Thunderbolt 2 drive unless it’s for legacy support issues.

Note that Apple makes a bi-directional Thunderbolt 1/2 to 3 adapter if you need to connect the one to the other. It does not transfer power, however, so you can’t use it on its own with bus-powered external drives. You’ll need a powered dock for that.

eSATA is another legacy port that’s basically disappeared. Created for attaching external storage to your computer’s SATA bus, eSATA was a cheap way in its day to get beyond the 60MBps performance of USB 2.0. USB 3.0 put the last nail in its coffin. As with Thunderbolt 2, the only reason to invest in an eSATA drive is for use with older computers.

A second drive as backup?

In backup, there’s a fundamental maxim appropriately named the Rule of Three. It states that you should always maintain three copies of your irreplaceable data: the original data, a backup, and a backup of the backup. Preferably, the two backups are kept in separate locations, one being offsite. Keeping a copy online is great for smaller amounts of data and certainly meets the offsite criteria. However, for vast photo, audio, and/or video collections, external drives in pairs (or more), are a faster, more practical solution.  

Create complete backups alternately to the two drives every few months. True patrons of wisdom might even take the second drive to work, so there’s no chance of losing both drives to the same local disaster.

For more guidance on building out the best backup plan possible, see our roundups of the best cloud backup services and best Windows backup software.

How we tested

We use our standard storage test bed to evaluate the performance of every external drive we review. It’s a six-core (twelve-thread) Intel Core i7-5820K on an Asus X99 Deluxe motherboard with 64GB of Kingston DDR4 memory running Windows 10. 

A discrete Gigabyte Alpine Ridge Thunderbolt 3 card and Ableconn USB 3.2 2×2 20Gbps card (Asmedia 2142 controller) are used for connecting the external drives. An Asus USB 3.1/10Gbps (Asmedia 1142 controller) card was employed for some of the older drives on the chart. 

We run various synthetic benchmarks including Crystal Disk Mark 6/7/8, AS SSD 2, and Iometer. We also perform real-world transfer tests using a 48GB batch of small files and folders, as well as a single 48GB and 450GB files. The testbed boots from a NVMe drive, but the real-world (Windows) file transfers are performed to and from a 58GB RAM disk.