You can easily detect when a device is performing subpar and, and with the spinning disk, you can see is transfer speeds deteriorates over time. 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. On an older MacBook Pro the rates I see are 500 MB/S both read and write, as you would expect. 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. 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. As a powerful player program, AVI video player supports to play all popular video formats. Freely play popular video formats on Mac. Create a disk image (.dmg) using the disk utility specifying file->new image->blank image. Mac Free Disk Player provide smooth video file playback on Mac. I found a workaround that will report the rates of the Startup Disk. No added bundles, installers or toolbars. 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. Hand picked software titles - only the best Tested for malware, adware and viruses. Blackmagic has been updated to adequately report the speed of SSD devices.

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