![]() It uses the Windows Explorer or macOS Finder to copy a 1.23GB test folder full of several different file types from the testbed's internal drive to the external hard drive being tested. The final test for external drives is a drag-and-drop test. We also use Crystal DiskMark's 4K tests to measure random reads/writes, which reflect data activity in which the drive is fetching and writing scattered files and pieces of files across the hard drive or solid-state drive. Crystal DiskMark's sequential-read tests measure read/write activity with data written in a large contiguous block on the drive, which is similar to how manufacturers themselves test drives to advertise their performance. ![]() We also use the Crystal DiskMark utility for a second opinion on throughput. ![]() These scores are useful in discovering the theoretical maximum speed that a drive can achieve. But it also returns some useful throughput measurements.īlackMagic offers both a read score and a write score, which we also compare with those of other, similar drives. This utility is typically used to discern whether a given drive has enough throughput to play back specific video formats smoothly. We use the macOS-only BlackMagic Disk Speed Test app from professional media software firm DaVinci to perform this test. Our next test measures a drive's throughput in bits per second. The score is only meaningful relative to other scores. We mention this score in each review and compare it with the scores that other, competing drives received. The PCMark 7 Secondary Storage test results in a proprietary score that is usually in the thousands. These simulated workloads include a Windows Defender virus scan, an image-import task, a video-editing session, and application launches. The Secondary Storage test is trace-based, which means it measures how quickly software commands are performed during everyday workloads to which you might subject your PC. The company's benchmarking apps are used not only by publications like PCMag, but also by drive and PC manufacturers themselves. Our most wide-ranging benchmark is the PCMark 7 Secondary Storage test. We also test on a 2016 MacBook Pro, using the Type-C/Thunderbolt 3 ports, for certain of our tests. 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.We test external drives using an Intel X299-based testbed equipped with all the trimmings, including a USB 3.1 Gen 2 USB Type-C port. 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. Create a disk image (.dmg) using the disk utility specifying file->new image->blank image. ![]() I found a workaround that will report the rates of the Startup Disk. 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 is now faster enough to rate internal SSD speeds, even the Startup Diskīlackmagic has been updated to adequately report the speed of SSD devices. ![]()
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