Blackmagic Disk Speed Test

Blackmagic Disk Speed Test Rating: 4,9/5 8417 votes

Hi,I have a 256GB PCIe SSD for a boot drive, and it's great. My main data drive (mainly audio, but also some photos and video) is a 2TB WD Black though, around 70% full. I bought it 4+ years ago.In the BlackMagic disk speed test I'm only getting around 100MB/sec read/write speeds, about the same as my Samsung F3 1TB from back in 2010.Isn't that a bit slow, or is it to be expected?If the drive is just old and slower than modern HD drives (perhaps the model is updated despite still being called a WD Black 2TB). If I purchase a more modern WD Black, what kind of speeds could I expect?I guess I'm asking - what speeds are you getting for traditional HDDs in a 4,1/5,1 Mac Pro with SATAII?Cheers!Ed.

Blackmagic Disk Speed Test Free Disk Speed Test is an easy to use tool to quickly measure and certify your disk performance for working with high quality video.

PCIe means it's internal inside the system, and not external on usb?These are my speeds of my old 7200rpm HDD external disks on usb3 and usb2 cables into the new iMac on usb3.Since I took this test, and wrote the data down. I got a usbc-sata3 adapter cable for the usb-c port and the SSD went from 265 write & 400 read to 266 write & 500 read (maxing out the disk).It depends on what the max is for that drive, which connection it's actually on, on both sides, and what speeds the cables, connections, etc are, and what the hardware can support at all. I don't want to hijack the OP's thread, but to avoid another thread about the Black Magic Speed Test thought I'd ask here.Has anyone experienced inconsistencies in the Write/Read results? This is happening to me where a variety of SSDs, even proprietary Apple units in my iMacs and MacBook Pros, give wildly inconsistent results. For example, a brand new Crucial MX500 500GB unit one minute will be 400/400 and more, and a few minutes later it drops to below 150/150. I even had a SSD this afternoon showing a dismal 50/50 where otherwise it is above 300/300. I don't want to hijack the OP's thread, but to avoid another thread about the Black Magic Speed Test thought I'd ask here.Has anyone experienced inconsistencies in the Write/Read results?

This is happening to me where a variety of SSDs, even proprietary Apple units in my iMacs and MacBook Pros, give wildly inconsistent results. For example, a brand new Crucial MX500 500GB unit one minute will be 400/400 and more, and a few minutes later it drops to below 150/150. I even had a SSD this afternoon showing a dismal 50/50 where otherwise it is above 300/300.

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I just picked up four 10 TB Seagate Helium enterprise drives for my home media server. ($305 )These read/write at 250MB/sec at the outer tracks (beginning of drive), and about 150MB/sec on the inner tracks (end of drive). (SATA 6 Gbps, but 3 Gbps could do those speeds )Note also that a drive that's been in use and is pretty full might have fragmentation issues, so in addition to the inner track slowdown, there could be extra head movement to access fragments of the test file. This could be especially significant if the drive was ever (even nearly) filled.doublepost=/doublepost. Also note that the disparity between outer track and inner track speeds leads to a practice often called 'short-stroking'. Companies would buy much larger disks than they need, and then partition them so that they're only using the faster outer tracks.Buy a 12 TB drive, and put a 2 TB partition on it.

The performance delta between beginning and end of the 2 TB partition becomes minor.I would guess, however, that the price reductions for SSDs makes short-stroking less common today. (There would be no reason or benefit to 'short-stroke' an SSD - although it might be done for over-provisioning. Howerver, leaving unused space on an SSD is called over-provisioning, not short-stroking, since no head movement is involved on an SSD.).

I don't want to hijack the OP's thread, but to avoid another thread about the Black Magic Speed Test thought I'd ask here.Has anyone experienced inconsistencies in the Write/Read results? This is happening to me where a variety of SSDs, even proprietary Apple units in my iMacs and MacBook Pros, give wildly inconsistent results.

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For example, a brand new Crucial MX500 500GB unit one minute will be 400/400 and more, and a few minutes later it drops to below 150/150. I even had a SSD this afternoon showing a dismal 50/50 where otherwise it is above 300/300.

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