From ModMyGPhone Wiki
Use mksdcard <size in MB> <filename> for creating a FAT32 image of a SD card. For example,
mksdcard 1024M sd_card
To make sure the image is used with the emulator, launch the emulator with -sdcard <path/filename> option.
On Eclipse, this can be done by going to “Run > Open Run Dialog”, in the “Target” tab,
add the option in the “Additional Emulator Command Line Options” :
For adding/removing files from the sd card, you can use the DDMS view in Eclipse or use the command ,
adb push <source path> /sdcard/
