The Sandisk Micro SDXC Extreme 4K card is a fast-writing memory card that can handle the large amounts of data on my Mavic Air. The size is just right for my drone's battery life and I have the option to swap out the card for another when changing the battery. Writing to an external hard drive is pretty quick, I know that from other memory cards. Brand that endures many, many paraphrases. I have never had a crash with a Sandisk Micro SDXC Extreme card and must have used some of them over 100 times. I also recommend the Extreme Pro card, which writes even faster and further reduces file transfer time to my hard drive. . I have several 32GB Pro cards but only use 64GB and larger Pro cards to take advantage of transfer speeds. For the Mavic, I would recommend using mostly 32GB cards so you don't lose even more files. in case your drone fails, crashes and destroys your map.
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