Why is my USB 3.0 connected external hard drive transferring files quicker than my two internal drives? I am using Windows 10.

  1. Internal Primary: 1TB NVMe Samsung SSD 960 (PCIe Connected)
  2. Internal Storage: 4TB WDC WD40E31X (SATA Connected)
  3. External Storage: 2TB USB 3.0 Interface Hard Drive

Now I have a 6.5GB Movie file on my Samsung 960 Pro which I copy to my 4TB WD internal at a rate of 100MB/s

I have the same exact file on my 2TB USB external hard drive which transfers to the same 4TB internal storage Hard Drive at 175MB/s

The same holds true if I try to move 20 large movie files.

Here are some benchmark results from two tools.

Performance Test 9:

Performance Test 9

User BenchMark:

User BenchMark

I had to remove the links for the drives because i don't have enough reputation to add the benchmark results Can someone please add them back

closed as unclear what you're asking by Ramhound, JakeGould, Run5k, Pimp Juice IT, G-Man May 1 '17 at 5:36

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  • Mazel tov! But what is the problem? – JakeGould May 1 '17 at 0:07
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    @JakeGould why is the USB 3.0 External Drive copying files to my 4TB internal drive have a better transfer speed than my 960 SSD to my 4TB Internal. Shouldn't the external drive be slower given the above information. – JordanGS May 1 '17 at 0:08
  • Did you run a benchmark tool on the hard drive? – SpiderPig May 1 '17 at 0:13
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    You could try CrystalDiskMark. Doing the sequential test should be sufficient in this case. – SpiderPig May 1 '17 at 0:16
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    When you copy a file and want to measure the transfer speed you need to wait a few seconds until the speed has stabilized. The initial speed is due to buffering in ram. – SpiderPig May 1 '17 at 1:40