All flash cards (SD/CF/SSD/etc) have a fixed erase block size.
I've done all my SSD's but never thought to do the flash cards.
The maximum resolution (consistent - no frame drops) I could do previously was 1600x840. After aligning the partition table I was able to get 1920x840. Good times!
Also, the expected MB/s calculations are borked with high frame-rates. I've noticed occasionally that FPS override sometimes displays funky results after being set. Most times if you go back to live-view and then back to ML menu it seems to reset itself correctly.
When trying to adjust for 23.976, often times I get it close enough, say 23.978, go back to live-view and mess around and when going back to ML menu, FPS override will now say 24.001 for instance.
Also, if I override to 48fps for instance, it appears that the MB/s calculations are getting based off 60fps set be Canon.
Also, raw2dng is displaying 30.848 fps on footage that was shot at 48fps