USB 3.0 port on HP Laptop not exceeding 40 MBPS using WD My Passport USB 3.0 External HDD.

[Speedster1]

Hello!

I tested the internal HDD with CrystalDiskMark and was able to get 109 MBPS both on sequential read and write tests. Then, when I tested my 1 TB WD My Passport USB 3.0 External HDD with CrystalDiskMark the sequential read and write speed did not exceed 40 MBPS the few times I tried. Got similar 30-40 MBPS speed when transferring movies from external HDD to internal HDD.

So far, I have tried updating the external HDD and USB 3.0 Controller drivers. Tried with 'USB selective suspend setting' disabled (Under Power Plan Options). Also tried with write caching enabled. But havent been able to solve the issue.

My laptop is running Win 10 Home 64-Bit. I am sure I used the USB 3.0 port. And, I used the USB 3.0 cable supplied with the external HDD. I don't have another USB 3.0 device so cannot figure out whether the issue is with my laptop of the external HDD.'

Please help me out here.

 

[Speedster1]

I was able to find a solution. Turns out that if you plug in a USB 3.0 HDD too slowly, then it will be recognized as a USB 2.0 HDD. This happens because in a USB 3.0 plug the USB 3.0 connector pins are in the second row. So, if you plug in the USB 3.0 HDD slowly then it gives the PC enough time to complete the protocol handshake and your USB 3.0 HDD is recognized as a USB 2.0 HDD before its fully plugged in. Which is why you don't get USB 3.0 speeds. So if you have a similar problem try plugging in your HDD quicker and see if it helps.