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? Type-C Compatibility What are the USB ports capable of charging devices at? Can I use this product on my 13 inch Macbook Pro ? How fast is SD card reader? Comments 0 comments Please sign in to leave a comment.