Magic Lantern xFat 64gb Sandisk problem! - "Automatically stopped recording"

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Last year, I bought x2 64GB Sandisk Ultra Class 10 30/Mb/s cards. I read on EOScard's website that you cannot use exFat ( http://puu.sh/9T2w5/a9a627038f.png ), which my card's is/was.

So I downloaded a program to convert it to FAT32 (FAT32 Formatter), ever since then with these cards, when I record with ML it does "stopped recording automatically" 95% of the time on the first record after turning on the camera and I have auto restart recording enabled for this reason.

After that initial "record fail" it won't do it again (I can stop and start recording as much as I want) that is, until I turn my camera off and turn it back on again.

I also see that the buffer scale appear and rise on the camera screen while recording every now and again. Not sure what allocation size is so maybe that is the cause of that, because surely the cards are more that fast enough considering they're Sandisk ultras.

Because of this initial record failure I often miss what I what trying to record.

Surely others have 64GB cards with exFat, how am I supposed to work with ML with the exFat format and everything like that?

I see on ML site that you can use 64GB card or something, but I don't know to do because this is kind of frustrating.

Is it a good idea to format from exfat to fat32? If so, what allocation size should I use?

Help??

[dmilligan]

Raw (mlv or raw_rec?) or h264? Camera? ML version? Settings used?

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h.264

550d

Same Settings that I use on my 32gb Card, which works fine, so not settings issue.