I want to transfer .mkv movie(which is 5.5gb) to my nook HD+ external sd card. When I'm doing it, windows pops out saying that file size is larger than device limit, but I have more than 10gb available. Also it says that device doesn't support .mkv files, but I can copy .mkv files that are small. Is this because external sd isn't formatted to ntfs? Or is this something with .mkv files? I'm on succulent's CM11 latest build.