This card tests around 50MB/s write, 90+ MB/s read with the Blackmagic Disk Speed test, but when running in Insta 360 One X is used, it fails about 14 times. -20 minutes of "too slow speed" recording. This camera records two files simultaneously at around 6MB/s each, but recording something else at the same time prevents the Gigastone from delivering the results it promised. After trying to contact customer service: no support available. They contacted me, asked what resolution I was recording the video in, then fell silent. A star. For the same money you can buy a solid brand.
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