I was having a few problems with the SD card with incomplete and not allowing recording
today I think I have solved the problem
I use this desk on a few recording outdoors and each time I use a factory default setting to start all over again on every new recording
I noticed when after resetting the desk and using the SD card it comes up incomplete as soon as I do a test speed but what I found works is to reset the desk to factory defaults and when it powers up switch off again and power up and when you do a speed test it all works fine with no problems
I have tried a few times resetting the desk to factory defaults and doing a speed test and all fail but if I power off the desk after a full reset and power off again to speed test works fine on a power up
hope this all makes sense but had to find out what was happening