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? Can the Type-C port be used to output video or data transfer? What is the max resolution that this adapter can handle? What are the USB ports capable of charging devices at? Comments 0 comments Please sign in to leave a comment.