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Slow file copy between internal and USB3 device that perform much faster in benchmarks (even when using TeraCopy)

My brand new machine is giving slow transfer speeds between the internal and external hard-drive. I'm getting 10-25 MB/s even when using TeraCopy to move a batch of files.

Sometimes it even drops to 5 MB/s!

I'm copying 23 GB of 50 KB - 1MB files, could that be cause of the problem?

Edit: Just tried it with a single 256 MB file and that transferred at around 50 MB/s, so I guess that was the problem.

Specs:
1. i5 4440 Quad Core @ 3.1Ghz
2. 32GB Ram
3. XFX Radeon HD 7750 /w 1GB
4. ECS B85H3-M4 Motherboard
5. Windows 7 x64 Professional

--- 1TB SATA6 Toshiba (one pass to show speeds)
Usage: 33% full
Sequential Read : 114.402 MB/s
Sequential Write : 119.700 MB/s
Random Read 512KB : 42.667 MB/s
Random Write 512KB : 41.289 MB/s
Random Read 4KB (QD=1) : 0.597 MB/s [ 145.9 IOPS]
Random Write 4KB (QD=1) : 0.786 MB/s [ 191.9 IOPS]
Random Read 4KB (QD=32) : 0.787 MB/s [ 192.1 IOPS]
Random Write 4KB (QD=32) : 0.968 MB/s [ 236.2 IOPS]


--- 3TB USB3 Samsung D3 (just did one pass to demonstrate it is operating as a USB3 device)
Usage: 11% full
Sequential Read : 146.401 MB/s
Sequential Write : 105.572 MB/s
Random Read 512KB : 46.990 MB/s
Random Write 512KB : 63.157 MB/s
Random Read 4KB (QD=1) : 1.228 MB/s [ 299.8 IOPS]
Random Write 4KB (QD=1) : 5.988 MB/s [ 1461.9 IOPS]
Random Read 4KB (QD=32) : 0.628 MB/s [ 153.3 IOPS]
Random Write 4KB (QD=32) : 6.880 MB/s [ 1679.7 IOPS]
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More about slow file copy internal usb3 device perform faster benchmarks teracopy
  1. Best answer
    Yes... when moving small files it won't hit high transfer speeds, only with big files you will be able to hit max speeds (assuming those files aren't fragmented)
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