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Blackmagic disk speed test vs4/29/2023 ![]() ![]() However, unlike AJA or BMD’s tools, Activity Monitor can’t be isolated to report results on a single device. For now, however, be careful relying on either of these software tools until we learn more.Īpple’s Activity Monitor can be used to measure data transfer rates. All three said they would look into it and get back to me. Some variation is to be expected, but not this much. The problem is that we don’t know which one is the most accurate.Īs I mentioned at the beginning, I reached out to OWC, AJA and Blackmagic Design to get their interpretation of these results. Here are the detailed results of my tests.Ĭlearly, there is a significant difference between these two tools – and there shouldn’t be. However, consistency is not the same as accuracy. BMD reported far more consistent speeds than AJA. NOTE: The lower the standard deviation, which is measured in MB/second, the more consistent the speed. NOTE: While the difference between read and write speeds is due to the Thunderblade, the differences in speed measurements are due to the software design.Īnother troubling aspect of these results is that AJA System Test Lite reported a much wider fluctuation in speed measurements – especially in write speeds – than Blackmagic. AJA System Test Lite consistently recorded read speeds 21.8% slower than Blackmagic Disk Speed Test.AJA System Test Lite consistently recorded write speeds 44% slower than Blackmagic Disk Speed Test.Same day, same computer, same storage, same data file size (4 GB), same connection (Thunderbolt 4) - wildly different results. I used four tests here simply to save space. NOTE: As part of my Thunderblade review, I ran twelve speed tests on each software and got very similar results. I ran four tests using each software to measure the read and write speeds of the Thunderblade. I created a RAID 0 using an 8 TB OWC Thunderblade SSD, which uses four NVMe SSDs. Clearly, one – or both- of these software tools is wildly wrong. Some variation during tests is expected, but this amount of difference is ridiculous. There is a 40% difference when measuring write speeds and a 22% difference when measuring read speeds between these two software tools. Since we use both these tools daily to measure and verify the performance of our system, these differences trouble me - a lot. Except, I get significantly different results when testing storage speeds using AJA System Test Light versus Blackmagic Disk Speed Test. (Read that review here.) This hardware speed demon is designed to maximize data transfer speeds using Thunderbolt 3 or 4. ![]() This last week, I was testing the speed and capacity of the new OWC Thunderblade SSD RAID. By the way, thanks for all your work testing and documenting the test results, very much appreciated.” I don’t have any information on why there is a discrepancy between the full AJA system test and BMD, however I will let you know as soon as I have update from Product Development. Today their tech support emailed me: “I did forward your test results to Product Development for review and they did acknowledge the Lite version has an issue. (Errors also exist in Apple Activity Monitor.) Assume whatever test results you are looking at are wrong. So far, no developer is able to explain these differences. Here’s an updated article looking at the differences between measurement tools. As always, I’ll keep you posted as soon as I hear back from them.” Since then, I’ve heard nothing. Blackmagic PR wrote: “Thanks so much for sharing this information – I’ve passed this along to the Blackmagic Design team. I’ve heard back from OWC, Blackmagic Design and AJA. ![]()
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