Nevertheless, if you would like to measure the performance of your Fusion drive, use the larger 5 GB stress file size, and watch the speedometers closely. Finally, if you're testing a, remember that a Fusion drive is usually not the best candidate for being the storage target for video recording or playback since it's difficult to predict where the video files will be stored, on the fast SSD or the slow hard drive. The idea is to make sure the Disk Speed Test is actually testing the write, read speed to the platters of a mechanical drive or the flash memory modules of an SSD, and not the faster memory cache used in the drive's controller.
The size you choose is important and ideally, it needs to be larger than any cache a hard drive may include in its design. The choices are 1 GB, 2 GB, 3 GB, 4 GB, and 5 GB. It’s really just the size of the dummy file the app will use for writing and reading. Blackmagic refers to the test size as the stress size. You should then be able to run the speed tests without issues. The workaround is easy enough when you wish to test your Mac’s startup drive, simply select your own home folder as the directory to be tested. Disk Speed Test is run with the same user privileges as the login account you're using, and the app doesn't have the ability to ask to raise permission levels by asking you for your password. This isn’t a bug, just a bit of a logistics problem. One problem you may run into is if you select the startup drive, you may see an error message that Disk Speed Test can’t be run on the selected drive because it is read-only. Using the Select Target Drive item will bring up a standard Finder file dialog box, allowing you to locate the drive you wish to test. Blackmagic Speed Disk Test WindowsĪs a test is being run, the panel will fill with green checkmarks for each format, depth, and read or write speed that the volume under test can support for video capture and playback. Each format in the panel has multiple options for color bit depths, and individual read or write checkboxes. The Will It Work? Panel includes a list of common video formats, ranging from simple PAL and NTSC on up to 2K formats. Just below the two main speedometers are the Will It Work? And How Fast? Results panels.
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