![]() ![]() What Else to Keep in Mind When Talking About Copy Speeds While the speed test gives you some reliable results when you configure it correctly, there are certainly other factors that can influence your actual copy speed, and that should therefore be kept in mind. Processes like e.g., creating the destination files have to be performed many times).įor this reason, in order to get results that you can rely on, it is important to configure the details of a speed test to be close to your actual scenario. As a result, copying many single files creates more work for the system and, therefore, a lot of overhead (“overhead” describes additional data that has to be taken care of but is not part of the actual user data to be copied. The reason for this is that each of the many files has to be treated individually during the copy process. For the system, it makes a big difference whether one large file of 5 GB or 3000 single files adding up to 5 GB have to be copied. In these cases, the actual speed of copying file sequences can be significantly lower than the speed during testing with one large file. However, during the actual job on set, file sequences have to be copied (one file per frame). It can be the case that speed tests have been performed simulating the copy of one large (movie) file. Open the “Settings” from the left bar to be able to set the test to file per frame or single file. a file sequence, which is one of the major factors to consider. ![]() Additionally, it lets you distinguish between copying a big single file vs. ![]() ![]() The AJA speed test for example allows you to set the format, resolution and file size to be simulated during the test (see image above). The Aja System Test lets you configure speed test details highlighted on the left. We would generally recommend the AJA speed test because it provides more detailed options to configure the test in the right way for your needs. The Blackmagic Design Disk Speed Test is available through the Mac App Store.There are different hard drive speed test applications available: Among the most popular are the “Disk Speed Test” by Blackmagic Design and the “System Test Lite” by AJA : Therefore as an alternative, there are digital tools available that can help you determine drive speeds reliably: But only if you use them the right way! How to Run Reliable Speed Tests The problem with this is that it would be extremely time-consuming – time which in most cases you don’t have. To determine a drive’s write speed, you could, for example, run a large test backup and then calculate the speed from the amount of data and the resulting time. So the desire for rational information – primarily about the write speeds of a hard drive – pushes you to implement reliable speed tests: And even if you could, you would still want to check and see if it also applies to your specific system in your particular scenario. The main problem is that you cannot necessarily trust the speed information that is provided by the manufacturers. Generally, you want to make sure that you know the performance of your storage as accurately as possible, so you will be able to predict the duration of copy jobs and avoid unpleasant surprises on set. Yes, that’s right: You want to know how your drives will perform when you are responsible for copying movie data. Why You Should Want to Know Your Drive Speeds as Accurately as Possible The article will outline why it’s important to know the performance beforehand, evaluate different methods of determining the expected copy speeds, and discuss some additional factors that can influence copy speeds and should be kept in mind when comparing numbers. Primarily we will focus on the write speeds (how fast you can copy onto a drive), as this is the main factor if you want to run a backup. One factor we cover in the following is the performance of a drive. There are various factors that can influence your final choice of hard drives, some of which we’ve already outlined in a previous blog post about criteria for choosing your on-set storage. Selecting the right physical storage medium is a general task before shooting a digital movie. ![]()
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