I Think I can confirm that 1280 x 720 24p, can record continously in raw video
im using
http://www.amazon.com/SanDisk-Extreme-Class-Memory-SDSDX-016G-X46/dp/B0037FLUYU1. Im formated my new card with exFat in diskutility (im using mac)
2. Im using satriani 1st july, and copy all files from my old memory card (DCIM, ML, Misc, Rom.dat, autoexec.bin, 650 safe dumper) in to a new card
3. open macboot to create bootdisk in my new card, and prepare a card
4. put my new card in 650D and running ML
5. disable global draw
6. start recording raw video 1280 x 720, 24p
7. record until my card full
First Try:
left is my file size (more than 15 gb)
right is my my available free disk space
Second try: