![]() 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.
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