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I have a single 5.5GB file on a slow internal SATA-3 magnetic HDD. Windows 10 claims that disk is only "1%" fragmented. The sequential read performance is around 95 MB per second according to crystal disk mark. I made sure there are no other processes running that could interfere. I want to copy that file to my NTFS formatted ADATA external USB 3.1 SSD. It's connected directly to my USB 3.1 type C connector on the main board using a very high quality brand name cable. The sequential write speed measures more than 500 MB/s.
Now I'd expect at least 50-70MB/s because the conditions are near perfect and the benchmarks show what is possible. Instead I'm getting only 30-45 which is less than half of what the benchmark achieves. Are there any bottlenecks I may have overlooked?
Andreas Hartmann
Posted 2019-08-03T16:36:15.217
Reputation: 1 072
USB 3.1 can mean one of two things, USB 3.1 Gen 1 which has a transfer speeds of 5 Gbps or USB 3.1 Gen 2 which has a transfer speeds of 10 Gbps. Which one is your SSD? – Ramhound – 2019-08-03T17:20:57.450
You are overlooking Windows. Try copying using the free FastCopy, which can achieve true hardware speed.
– harrymc – 2019-08-03T17:20:58.353