Leo. I will jump in too. I bought a 64G uSD card specifically for my DX50. Opened it from the package. Popped it in the built in slot of my computer. Copied files and plugged it into dx50. It worked and has worked for about a month. My thought is that I'm not going to mess with anything until it doesn't work. I am not familiar with partition manipulation at this time. I have 4th batch and still running 1.2.2.
Thanks Howlin for jumping in and like you, really got no idea how to manipulate with partition. Since you have used a card out of the box without any issues, I think I'll just do the same and hope everything goes well. Never been savvy with any IT related stuff and kind of a challenge in itself taking the plunge for the DX50. Beginning of a learning curve I guess and would need a lot more help along the way. Also, not forgetting the efforts of all the members here who have contributed in the FAQ thread for the valuable information thus making it easier for me. Thanks guys.