Really should have designed these mixers to record to a single multitrack .wav file like another company that I also own. Sure, you have to split the file once you get it on your computer for DAW work, but you don't have the problem with only one to two brands of high speed SD/uSD cards that sometimes work after you go through a few bad ones even in the recommended brands/speeds. It takes a lot of the card write speed problems away just writing a single stream 32 track multi-track .wav file versus writing 32 separate .wav files simutaneously.
I love my Series III StudioLive! However, the MG brands did better with the multitrack SD card recroding/playback! If this were updateable in firmware one day as to how the Series III writes the tracks (switch to single multi-track file) it would solve the eternal pain in the rear end with SD card multi-track recording on these boards! Not bashing the brand, just the choice in how to write to the SD.
With the other brand, even though they probably can't comment, I format 512GB SD cards FAT32 and have ZERO issues because they use a single multi-track .wav file (single file stream write, and then you use a tool to split the multitrack wav file into individual track wav files). I'm recording 32 tracks for hours and hours and hours before having to go to another card.