An SDHC Class 10 SD card with a write-speed capability of at least 40 MB/s and read-speed capability of at least 90MB/s is required (32 GB SanDisk Extreme recommended). We have found that not all SD cards are created equal, and some SD cards rated for 40+ MB/s write speed are actually quite a bit lower than that in practice. We strongly recommend using the SD card provided with the camera (see below).
Note that SDHC SD cards are limited to 32 GB in storage capacity. SDXC SD cards are not compatible with the RedEdge camera.