I am using MQX for my project, Where i am not able to use USB device 8GB or more than that. If i use flash drive more than 8 GB. I could see write as success but it is not actually written into it. I tried to do flush but it is not working. I am missing anything in the configurations. Please update me if any,
Could you let me know which board you are using , and echi or khci?
I would suggest you try to test this case with the latest MQX 4.2, to see whether this issue still exist.