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. On an older MacBook Pro the rates I see are 500 MB/S both read and write, as you would expect.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. When you jump to 60p 4K (2GB/s+) and RAID5/6 than this is not that trivial and requires good components, not just any hardware. I have tried this on my older mackbooks with SSD and they do scale down as the device is older. 1GB/sec is not that hard, but things are more complicated when you want safe storage and quite big. 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. Controller is Raidcore BC4852 (Ciprico) in. Now in 8 disk RAID5 read 440 MB/s and write 430 MB/s. Results from 72.9 to 78.6 MB/s Read and write speeds were almost identical. I tested with Blackmagic speed test every single disk before I built RAID5. Mount the volume (if it is not already mounted).In Blackmagic select the disk image mounted. Those Seagate 320/16 disks look very promising. 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. Blackmagic has been updated to adequately report the speed of SSD devices.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.I found a workaround that will report the rates of the Startup Disk.
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