Review on Sony M Series SDXC UHS-II Card 128GB V60 CL10 U3 Max Speed 277MB/S Write 150MB/S Black (SF-M128/T2) by Raul Fabijan

UPDATE: I've used these cards a few times and think they're not impressive. I bought a new USB3 SD card reader and still have no improvement in read/write times. What was actually even more concerning was that they increase the write speed and take a few seconds to reach full speed, which is still out of spec. OTH The Sandisk card I have immediately increases read and write speeds and runs faster. and worth 1/2 the price. I think I can return them. Works well for 4K 400Mbps recording in Fuji XT3. My 2 SD card readers, one via TB3, the other via USB3, have write times of 85MB/s and 70MB/s. It's clear that one SD card reader is a bit slow and the other, but I expect better writing performance. I've filled out the cards before, and it didn't affect the testing time, which is good.