What do you mean by
"
Trying to understand how to load an SD card from the Brennan B2 "?
All B2 except some very old models have TWO storage media in them, an HDD/SSD on which your music data is stored and an SD Card on which the Brennan Operating system software is stored and from which the B2 boots.
It is not a good idea to mess with the B2 SD Card (although if you know what you are doing it is OK to do this).
However if you mean you want to load an SD Card (that you have lying around) with music taken from the B2, this is OK.
To do this you will need a USB hub into which you can load said SD Card. Format the SD Card to FAT32 (using the B2 menu commands for doing this)
Make a playlist of all the music you want to put onto the SD Card.
Then use this menu command to write the SD Card
Once it has finished then press and hold in the Play/Stop button until "Saving" appears on the front display and wait until the clock reappears before removing the USB card / hub.
Fred