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Because of that, it can handle a higher number of threads during random reads and writes, as well as a larger queue depth.Ĭomparing those two drives, we can see that the Q32T1 for the Seagate Portable was actually faster than the Q8T8 test, whereas the opposite is true for the ADATA SD600. Because of that, it’s important to consider the computer and hard drive when analyzing results.įor example, a solid-state drive, such as the ADATA SD600 (read our ADATA SD600 review), is able to read and write data much faster than a traditional spinning drive, such as the Seagate Portable (read our Seagate Portable review). The larger the queue depth and thread count, the more demanding the hard drive is on itself and CPU resources.

The reason for differing thread and queue depth sizes is to get a bird’s-eye view of how the hard drive will perform in different scenarios. The results from this test are the worst, as the drive has only a single request queued up and can only process one request at a time.

4KiB Q1T1: Finally, this random test uses a queue depth of one with a single thread.

This result is usually slightly slower than the Q8T8 test, as there are fewer threads.

4KiB Q32T1: This is another random test, except this time CrystalDiskMark is using a queue depth of 32 with a single thread, much like the sequential test.

The results from this test are what we use to compare random reads and writes. There are also eight threads, meaning eight processes can happen at once. In this case, there’s a queue depth of eight, meaning eight requests are ready to happen at any time.

4KiB Q8T8: All other tests are for random reads and writes using a 4KiB block size with varying queue depths and threads.

We’ll talk more about that in the following test. The “Q32T1” part refers to a queue depth of 32 with a single thread. Sequential performance isn’t usually indicative of real-world performance, but that’s what’s most often advertised for external hard drives. As the name implies, sequential reads and writes happen in sequence, meaning the hard drive reads and writes information in blocks next to each other.

Seq Q32T1: The first test is for sequential reads and writes.

To fully understand what our numbers say, we’re going to provide a brief overview of each test.

In total, there are four tests, each of which have two results, one for reads and another for writes. Our CrystalDiskMark test is set up to use a 4GB test file with five passes, running all of the tests available in the application. By ordering and paying for the external hard drive, we close any possible gap between our results and the speed you’ll experience. Instead of asking the manufacturer directly for a sample, we order the hard drive off Amazon to ensure we don’t test a cherry-picked sample. When it’s all said and done, we have two points to directly compare external drives.īefore testing, though, we need to actually acquire the external hard drive. There’s an actual benchmark - in this case, CrystalDiskMark - as well as a hands-on test, when we transfer a 2.3GB test folder filled with videos, music and photos. We use four benchmarks for testing external hard drives, two of which focus on speed. That way, you can view our results and choose the best external hard drive for your needs. External drives that made the list performed at or above expectations, given how they’re built.īefore getting to our picks, though, we want to talk a bit about how we tested each external hard drive, as well as how we analyzed the results. As we’ll talk about in a moment, speed wasn’t the only factor we considered, but it was the most important. Using our external hard drive reviews, we’ve narrowed down the five fastest external hard drives we’ve seen. In this guide, we’re going to run down the fastest external hard drives we’ve tested. Although you should factor in build quality, capacity and features depending on your use, the crux of what makes an external hard drive worthy of our best external hard drive guide is how fast it is.

Speed is king when it comes to external hard drives.

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