That is great. I had mentioned before to another to just buy a card and find out. That is the purpose of exFAT to extend that.
The reader relies on the header of the format media to tell it what the format is. There are around 48 for 52 different formats used in magnetic storage today and more are being created. Some controllers for readers, however, are limited due to what
system they are made for. If you tried those cards in a digital camera for instance, they may not be readable. Digital cameras have a fixed format set into them.
There is a word of caution for those who are looking into the TerraByte hard disks: I had a guy call me up and his vanished off of his system and was only two months old. A major brand at that and failed. Took everything with it. Most people do not
need capacities of that amount unless you are setting up a server (and a RAID configuration is mandatory).
The TerraByte sized SD cards are not for sale yet here in the States. I have been looking for those and have been intending on getting one to test it out. If I can get one, I will get the reader to go along with it and test it with my RT in several configurations
and let everybody know on this thread if the RT can read them or not. If the RT can read them, the Pro models will also.