I recently had another thread talking about issues with a generic NEC USB3.0 card. I never did get it working, so I wound up selling that card and buying a Lacie card, unfortunately I'm still having issues. The only USB3.0 devices I have are WD MyBook Essentials external drives....So here's whats going on. Installed the most recent Lacie Drivers : http://www.lacie.com/us/support/drivers/driver.htm?id=10239 Updated MyBook Firmware and installed WD Mac+Turbo Driver: http://support.wdc.com/product/download.asp?groupid=125&lang=en The drive does not mount when connected to USB3.0 port. Nor does it show up in System Info or Disk Utilities. As soon as I turn the drive on my wireless Magic Mouse starts lagging horribly. When I connect the drive to a USB2.0 port it works fine. I called WD and they've decided to send me a new "correct" USB3.0 cable. I have three of the same drive which mean I have three cables and none of them worked.. Any help is appreciated. ---------- EDIT: Agh, I just called Lacie and they told me their PCIe card will only work with Lacie hard drives. Anyway around this?