Can I use both SD and Micro SD card slots simultaneously? John July 06, 2018 09:42 Updated Follow A. No, only one card slot can be used at a time. Either the SD card slot or the Micro SD card slot can be used at a time. Related articles What Macbook is this compatible with? How do I connect the hub on my 13 inch MacBook Pro? What is the max resolution that this adapter can handle? What are the USB ports capable of charging devices at? Quick Guide Comments 0 comments Please sign in to leave a comment.