If you want to try out the Nintendo Wii [Homebrew Channel][wii], you’ll need to do the [Twilight Hack][th]. To do that, you need a Fat-16 formatted SD card. Here’s the command to format the card on Mac OS X (1.5 and 10.6):
[wii]: http://hbc.hackmii.com/ “Homebrew Channel”
[th]: http://wiibrew.org/w/index.php?title=Twilight_Hack “Twilight Hack”
>`diskutil partitionDisk /Volumes/WII 1 MBRFormat “MS-DOS FAT16” “WII” 1000M`
Where `WII` is the name of the drive. The `1000M` at the end is how big you want the partition to be, but if the card only has one partition, it will use the whole card, anyway.