Which is about 45MB/second, about half of the published write speed for these 1TB cards. The SD standards have been moving up the transfer rates. The UHS-III d

Which is about 45MB/second, about half of the published write speed for these 1TB cards. The SD standards have been moving up the transfer rates. The UHS-III does 624MB/sec. The new SD Express standard will do 985 MB/sec by presenting a PCIe Gen3 or NVMe directly. (Obviously more contacts, but they are backward compatible with the older interfaces.) They just announced the SD Express interface for microSD cards as well. I'm not sure any products are available for SD Express yet.