The SanDisk Extreme Pro 128GB CompactFlash Cards are not yet qualified for use with the Ki Pro Mini; we do not recommend using media until it is qualified for use with the product.
To record long durations, the original Ki Pro product is typically recommended as it is supplied with a 250GB Storage Module that can be used to record hours of Apple ProRes 422 material. The Ki Pro Mini currently supports the 64GB capacity of the SanDisk Extreme Pro CompactFlash cards. This means that the recording time possible, when using Apple ProRes 422 and the 64GB capacity CF cards, would be between 45 or 50 minutes. (This approximation is given since Apple ProRes 422 is a variable bit rate codec.) You can refer to the free AJA DataCalc application - available for desktop computers and the iOS products (iPhone, etc.) - for calculating the storage requirements of various formats, frame rates and codec types.
If you have further questions, please don't hesitate to contact AJA Technical Support for assistance.
AJA Video Systems
+1 (530) 274-2048 Intl.
(800) 251-4224 US