I have a ASUS K55VM laptop which has 2 USB 3.0 ports. I'm running on Windows 8 x64. When I use plug in a USB 3.0 external hard drive from any 1 of the USB ports I get write/read speeds of only ~25MBps. This opposed to my other laptop (Dell XPS with USB 3.0 ports also running on Windows 8 x64) gets ~100MBps.
I have also searched for installed the relevant drivers for my ASUS laptop.
Intel points out the following:
USB 3.0 Support
Here's the link to the FAQ Intel article: USB 3.0 devices are not working at USB 3.0 speed in Windows 8*
In the second link, I do not understand the cause. I have included a picture of the device manager for reference.
Here's a picture of the external hard drives in question. It's a Toshiba Canvio 1TB.
When I plug it onto the ASUS one, notice that the light glows WHITE
.
When I plug it into the DELL one, notice that the light glows BLUE
indicating that it is functioning in true USB 3.0 mode.
Best Answer
Ensure first that you have installed the latest BIOS, then read further if the problem still exists. Check carefully that the linked version is later than the one you have.
From Windows 8 and Intel USB 3.0 Host Controllers :
The article then describes in great detail how to force the installation of the Intel USB 3.0 eXtensible Host Controller Driver. The download link it gives to the Intel site will contain the latest version, rather than the one mentioned in the article.
However, before executing this, I suggest to ensure that you have backups, at least creating a system restore point (but even better is taking an image of the system disk).