Usb speed test8/30/2023 ![]() That means the drive will really slow down as you move from the outer track to the inner. It might be about 1.75 inches on the outer track, but only 0.75 inches on the inner track. The density you can't really control, but the RPM you can, the more RPMs the faster the raw speed.Īlso, note that the radius of the platter changes based on where the head is. Throughput = radius * 2PI * density * RPM Thus it you know the density (bits/inch) you can calculate the data speed: That's 7.2GB/min which is really fast.īut be aware a rotating disk reads/writes at the speed the platter spins under the head. I'm very happy if I see a new device hit 120MB/sec. USB3 devices should be between 50 and 150MB/sec. Then you need to make sure the data actually gets to disk, add "conv=fdatasync" at the end of the first line to do that.Īs to normal speeds, USB2 devices / ports normally do between 10 and 20 MB/sec. I normally test with 10GB just to be sure. The disk and controller also have a cache that you aren't dropping, so you need a bigger test to make sure those caches aren't corrupting the results.īump that up at least 1GB. First that is only 100MB that you are writing.
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