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

Tags:
  • Windows 7
  • USB3
  • Devices
  • External Hard Drive
Last response: in Windows 7
February 15, 2014 8:04:58 PM

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]

More about : slow file copy internal usb3 device perform faster benchmarks teracopy

Best solution

a b $ Windows 7
February 15, 2014 8:22:42 PM

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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