I installed a 32GB micro card by Sandisk...it's pretty common. Be forewarned that you may still get that same warning even after installing the micro card regardless of its size. The RV 760LM does not works the way you may think. The whole unit, when plugged into your computer, appears as a storage device (like another hard drive). Installing a micro card into it makes that "hard drive" larger by the amount of storage on the micro card.
__________________
|