WD My Book
WD My Book

Best desktop external hard drive

Available in capacities of up to 4 TB, the WD My Book gets high marks from reviewers for its speed and ease of use. In professional tests, it transfers files quickly and quietly, and reviewers say it's also easy to set up.
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Seagate Backup Plus Slim
Seagate Backup Plus Slim

Best portable hard drive

The Seagate Backup Plus Slim edges out its nearest competitor in every possible quality test. It's slimmer and lighter, transfers data faster, and gets better reliability ratings from owners. It's also a good value at $75 for a terabyte of storage, and you can upgrade to 2 TB for just $120.
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IoSafe Solo G3
IoSafe Solo G3

Best rugged external hard drive

For protecting your precious data against every possible disaster, you can't beat the ioSafe Solo G3. Built like a safe (and equally heavy), it can safeguard your files come flood or fire. The drive comes with a year of free data retrieval from ioSafe, which can be extended to three or five years for an extra fee.
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Est. $360 for 3 TB Estimated Price
Synology DiskStation DS1513+
Synology DiskStation DS1513+

Best NAS

The Synology DiskStation DS1513+ network-attached storage (NAS) drive offers fast speeds, a robust interface and a wealth of features. Its five-bay enclosure gives you lots of options for configuring your backup drives. (The drives themselves are sold separately.) Owners praise its speed and easy setup, though novices may have trouble setting up the more advanced features.
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Seagate Wireless Plus
Seagate Wireless Plus

Best wireless hard drive

The Seagate Wireless Plus is one of the most versatile hard drives on the market. You can access its 1 TB of storage wirelessly from multiple computers, smartphones or tablets -- or you can hook it up via a USB cable for faster file transfers. Battery life is up to 10 hours, and it comes with its own media app.
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External hard drives do more than safeguard your data

An external hard drive can do several jobs in your home or office. It can provide a place to back up your files so they won't be lost if your computer's internal hard drive crashes. It can also expand your computer's storage capacity, giving you more room for large files such as digital video, high-resolution photos and music collections. Finally, these drives offer a simple way of sharing data between computers by simply unplugging the drive from one machine and plugging it into another. They're typically faster than online backup services (which are covered in their own report), and they allow you to keep your files under your control, rather than entrusting them to strangers.

External hard drives can use two different types of technology. Hard-disk drives (HDD) are mechanical, writing to and reading from spinning platters. This type of drive offers the advantage of higher storage capacity at a relatively low cost per gigabyte (GB). Solid-state drives (SSD), by contrast, use flash memory in place of spinning disks. Most SSD drives are internal, but external drives that use flash memory are becoming more available. SSDs are significantly faster than HDDs, as well as quieter and more compact. In addition, their lack of moving parts makes them less vulnerable to physical damage. On the downside, they're also considerably pricier, and at present, no consumer model can store more than a terabyte (TB) of data.

Different external hard drives excel at different tasks. Portable hard drives are designed to let you take your files on the go. They're compact, relatively inexpensive (about $75 for 1 TB of storage) and able to run off your computer's battery via a USB connection. Desktop hard drives are bigger and pricier (anywhere from $100 to $350), but they also come in larger capacities, making them more suitable for storing giant multimedia files. Some portable and desktop drives are ruggedly built to protect the data inside from all kinds of physical damage, from falls to floods.

Some drives specialize in working with more than one computer (or other device) at a time. Network-attached storage (NAS) drives can back up and share files across multiple computers on the same network. Wireless hard drives can add storage without the need for a physical connection; most can also stream content from the Internet to your devices via Wi-Fi. Wireless external hard drives cost more per TB than either desktop or portable drives; the best-rated 1-TB drives are in the $200 range.

To identify the best hard drives in each category, we consulted reviews from a variety of computer publications and websites, such as PCMag.com, CNET and Macworld. These sources conduct detailed, in-house tests of external hard drives to determine how fast they are at reading and writing various types of files. Reviewers also talk in detail about usability, evaluating the setup process, the software that comes with the drive, and the ease of using it with various types of third-party software. In addition, they offer comparisons of value, noting how a particular hard drive compares to others in its price range.

The one factor that professionals can't always evaluate is long-term durability. In the test lab, they can't usually spend a long enough time with an individual drive to see how it holds up over weeks or months of use. Thus, we turned to user reviews from retail sites such as Amazon.com and Newegg.com for information on reliability. By looking at the hundreds or, in some cases, thousands of individual reviews these sites provide for a specific model, we were able to spot those with a pattern of poor reliability.

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