Default sim card question (yes, I know where it is:) )

on my s3, my music and pics were on the card, so, no worries whenI had to factory reset. I did my phone a few days ago and checked my stuff, and everything was gone. I may just be completely brain dead, but where the heck do I look to see my card, not physically, but through my phone settings. when I eject and then put the card back in it says card error (or something likethat). please forgive me if this is a silly question, I still carrythe noob title.