Hello,I have two of the Lexar Professional USB 3.0 Dual-Slot Readers connected to my home and studio Mac Pro systems and they have worked for me faultlessly and download files very fast. http://www.bhphotovideo.com/c/product/845797-REG/Lexar_LRW307URBNA_Professional_USB_3_0_Dual_Slot.htmlCheersSimon