Using exFAT on Stock 10.4.B.0.569 without mod at all.
Just got a class 10 MicroSD XC 64GB fot my Xperia Z C6603 and saw many post about exFAT not supported. Luckily, mine works with no fuss at all. So I'll post it for reference as I didn't see anyone mention this.
- First of all, I format the card with SD Formatter 4.0
from SD Association itself. Set it to exFAT. Should be done quick.
- Then I replace my old 8GB with this 64 GB(59 GB actually...) and start with SETTINGS > STORAGE > TRANSFER DATA TO SD CARD to test if it can write, and yes, it just work.
- Then I set USB Connectivity to MSC mode and plug into my PC. Windows Explorer says it's exFAT. So I put an 12 GB movie file in. It just work. Play in MX Player with no fuss at all.
Wish this useful and happy new year!