I recently installed Windows 7 via bootcamp on my new Macbook Air. I have a Seagate USB 3.0 drive that works great in OSX but behaves strangely in Windows. Windows recognizes that it is a USB 3.0 drive, but tells me that it's connected to a USB 2.0 port. This is especially weird since I definitely have the Intel USB 3.0 eXtensible Host Controller installed. I used USB Device Tree Viewer and determined conclusively that Windows is operating my drive at USB 2.0 speeds. What can I do to get my speed back?
On Windows, you need drivers in order to have everything working fine. In this case, the bootcamp should install it for you right after Windows installation. It installs all drivers: trackpad, graphic card, webcam, USB 3.0; as well as some bootcamp utilities that allow you to use the F10, F11, F12 as volume keys for instance.
If you didn't get this part during your installation, you just need to use the USB-stick you installed windows with and run the bootcamp software on it (it's the only
.exe you'll find).
See this Apple Support page to download it again (64-bit, Mid-2013 MacBook Air): http://support.apple.com/kb/DL1721