Red Error after having fortmatted the sd card

[Giorgio]

hi
yesterday I recorded a project after having formatted the sd card for the first time and a red error appeared after some seconds. After the error message there was a number followed by the letter K.
what does it mean? What did I do wrong?
before formatting the card everything worked...
thanks

[polite]

What type of file system did you format the card as? Is it the original sd card that came with the bluebox? if not, what type/class/size is it?

[Giorgio]

I formatted it on my Mac and it is the original card that I got with the bluebox. I formatted it in fat mode (maybe I should have used another one..)

[Lucas1010]

Always format micro sd cards using SD Card Formatter. exFAT is preferred.

[Giorgio]

Thanks. Do you think that might be the reason?