With single file YUV, 720p, FPS override on 24p, Large, I'm managing 127 frames on the 600D with the Sandisk 95.
Next step. Figuring out how to look at the damn things. On a Mac, and I'm too slow to get the 422 windows program running on here.
Blah.
Oh and with the same settings into separate files, looks like 98 frames.