I had an 17 inch Mid 2010 Macbook Pro (MacPro6,1) that had 3 USB2.0 ports, and a 34PIN expressCard slot. I heard one way to get USB3.0 I/O for this machine is to use a USB 3.0 PCMCIA expressCard. I know it is kind of late in the game, did anyone had experience any brand of expressCard that works? And which OS version does it work? Mavericks to High Sierra? I did do some research that card with Fresco FL1100 chipset works best as the drivers are part of the OS. I found this card at Amazon GMYLE(TM) ExpressCard 34/54 to USB3.0 Express Card Adapter Windows 7/XP/Vista seems to work. Had anyone try it?