I have this Transcend Storage Jet external HDD. I was using it with my desktop Win 10 which supported USB 2.0. The transfer rate was satisfactory over 15MB/s. However, when I tried it on my new Lenovo ideapad 510 which supports USB 3.0 and using its USB 3.0 port, the transfer rate is going at a few 100 KB/s.

The copy window seems to pause a long time interval and only updates the speed and progress bar for just 1 frame every so often. Below is the CrystalDiskMark of this drive:

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I've also tried the USB 2.0 ports on my laptop. The results are similar except for SeqQ32T1 and Seq which achieved > 30 MB/s

I've tried the following methods.

Disable Quick Removal Method

I've tried the most accepted answer of this: Extremely slow USB transfer speed but the problems are:

  1. It doesn't work
  2. My old PC also does quick removal and there was no transfer problem.

TeraCopy method

However, using TeraCopy, the speed can achieve 32MB/s with the USB 2 port on my laptop. But this is just avoiding the problem, not actually solving it. Actually, the result is exactly the same using Explorer to copy.

  • Something is really wrong with your HDD. A normal external USB2 HDD should have a full-blown read-write performance of 35MBps on USB2 ports using files longer than 256kB. It would be helpful if you indicate precisely which HDD you are having this problem with. – Ale..chenski Jan 27 '17 at 18:52
  • @AliChen the HDD is a USB 3 Transcend StorageJet. I have also indicated the speed using a USB 2 port can exceed 30MB/s – Daniel Cheung Jan 28 '17 at 3:47
  • You should edit your question to add the exact model number of the Transcend Storage Jet external HDD as well as the exact model number of your laptop. The reality is not all USB ports are created equally. For example, my USB 2.0 external hard drives performed faster on a USB 3.0 port on a Mac Mini 2012 model than the Mac Mini 2011 model. – JakeGould Dec 17 '17 at 6:13

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