SDXC (Secure Digital Extended Capacity) 4G B to 2 TB. Can i use this slot to Boot OS X or any Applications on my new 2013 rmbp?

Hi John, Thank you, I heard today that you cannot BOOT using this SLOT. Do you have a link to something that says what you are saying?

that is what i heard on one website. There seems to be some different views from different people on what all this slot can do. I was reading today and one website says you can boot from it and one says you cannot. OWC told me that this is not like a normal SSD or any hard drive. It is much differnt. Personally Why Did Apple CHOOSE to put this on the new RMBP? I don't get it. I liked the Express Slot better i wished they had not have changed it. But I am thinking that this was done for people who are using MBP for Editing and Movies and MEDIA...........Those Cards are very Expensive. Not to mention the Upgrade from 250 GB SSD to 500GB SSD and then 750SSD , I went with the 250 SSD to start with. But was hoping to use this SLOT for extra SSD space.

Thanks a lot John. Do you have a suggestion on the type or brand of Cards? and what is the most GB of Space that I can get in a Card?

a little reading upon this and you will find out just what all things can be done. i was really surpised to find out the things I can do with this NEW SLOT. I do miss the Express Card /34 Slot i have to admit. But I am going to LOVE having MORE SSD ROOM NOW........I cannot wait to get a 250 GB Card they are so expensive..........Maybe one day they will make a 1TB SDXC Card.