Tested with a Canon camcorder - XF100, the card is fully recognized and initialized to film without loss of quality, sound and image. Obviously the writing and reading speeds are sufficient for the shooting and the sound on several tracks. As to the capacity in time taken, it matters little, I prefer to have several cards and work in all cases with the best definition. Next, in terms of performance over time. Too early to tell, but this type of support remains an intermediate support.