Hopefully this is the right forum for this question.
After much searching I am unable to find a definitive answer to this.
I recently put the latest nightly omnirom on my Asus Transformer TF300T (omni-4.4.2-20140104-tf300t-NIGHTLY) and noticed that my NTFS formatted 64GB micro SD card no longer works and is picked up as blank and needs formatting when selected in the file manager.
No problem, I guess there just isn't NTFS support in the kernel yet.
So, my question is, can I re-format the card to EXT3 or EXT4 and be able to use it in omnirom?