How to format an sd card on a MAC?

Having a few problems starting most of the games on my card, i'm using an N5 and havent had an issue with it since purchase until now. Deleted everything off of it and then re-downloaded the kernels and replaced everything, but no luck, I can't work out how to format the sd on my mac... help plz?? tks guys

You'll probably need an external program. Wouldn't know of any though.

All good, worked out i could format my SD on my Nokia 6620c :P but i think that the legendary starfy infected my N5 because i reloaded it onto my card and it stuffed it again, a warning to N5 users, don't bother with Starfy... which is unfortunate because i really liked the game, guess i'll be buying it, cheers!

That's an interesting error.
Just another strike on the "Reasons N5 is a bad card" list.

Wouldn't be the specific game that is the problem.

dont know what else it could be, been runnin for a couple days now without Starfy, no other problems since i deleted the file, i tried this twice to be sure it was the file causing the problem, and downloaded the file from 2 different sources..

Would be the N5 software then.