SD Card Format

Does anyone know what format method needs to be used on a new SD Card?  I wish to create a second card so I can alternate and save running back and fore to the machine.  Also will allow me to load new files while the printer is printing ready for the next print.  I have tried Fat and Fat32 etc but they are not recognised.

Thanks.

http://forum.zortrax.com/index.php?/topic/2261-what-are-the-requirements-for-the-sd-card

http://forum.zortrax.com/index.php?/topic/2234-recommended-sd-card-to-stop-timeout-errors

http://forum.zortrax.com/index.php?/topic/2136-sd-card-not-recognized-anymore

Thank you.  I did a search on the term SD Card and found nothing.