

I have run Blackmagic on USB 2, thumb drives, USB 3, and USB C devices to see if I’m getting my money’s worth.

The Blackmagic Design DeckLink Mini Recorder 4K is a PCIe capture card that.
BLACK MAGIC SPEED WINDOWS 1080P
On an older MacBook Pro the rates I see are 500 MB/S both read and write, as you would expect. 0 1080p 60fps UVC & UAC HDMI Loop Out Compatible with Windows, Linux.

I have tried this on my older mackbooks with SSD and they do scale down as the device is older. On my 2016 MacBook Pro, I am seeing speeds like 1,000+ MB/s write, and 1100+ MB/S read. Since the “volume” is on your Startup Disk, you will see how fast it drive is. What does Blackmagic Disk Speed Test do Disk Speed Test is an easy to use tool to quickly measure and certify your disk performance for working with high quality video Simply click the start button and Disk Speed Test will write test your disk using large blocks of data, and then display the result. In Blackmagic select the disk image mounted. Mount the volume (if it is not already mounted). Make it big enough for Blackmagic to work with (7+ GB) and name it what you will. Create a disk image (.dmg) using the disk utility specifying file->new image->blank image.
BLACK MAGIC SPEED WINDOWS SOFTWARE
I found a workaround that will report the rates of the Startup Disk. Blackmagic Disk Speed Test is special software that allows MAC users to measure their disk performance and check if things are working the way they should. When Blackmagic tries to read the Startup Disk, you get the message that the device is not writeable, hence you cannot rate the the transfer rates of the drive. Blackmagic has been updated to adequately report the speed of SSD devices.
