Hello gregposchman,
Wen recording with the EOS C100, you can choose to use the double slot recording method. This makes the camera record the same clip to both cards, in the same format, not one in HD then another in SD. We are sorry for any inconvenience that this may cause you at this time.
If this is an urgent technical support inquiry, please consider contacting Canon technical support directly. You can do so through our web site.
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