Does your computer have an SD card slot built-in? Some of the latpops and iMacs do have the card slot built in. If you have a built-in SD card slot you can format the card using Disk Utility as a native Mac OS Extended format. Then it will be recognized by as a usable storage area on your computer, and appear in the Projects Tab. Disk Utility is located under Applications>Utilities>Disk Utility
well I have a 15' macbook Pro Thunderbolt built in serial reader plus the card is an SD xc 64 gigs 25mg per second high speed card.. it should do the job.
I feel it has something to do with the card format?