Hi Dave,

Not tested speed, but my aim is to get the absolute maximum speed by not actually using the FAT filing system but just writing bytes directly to the card. The FAT is already in existence in the card with the .txt file. I don't need to set file size changes to the .txt file etc as I'm just trying to fill the .txt file with the data. I'm trying to generate a setup that can read I2C data from multiple sensors and up to 200 Hz if possible and stream the data to the SD card (starting a new write_block at each 512 bytes...)