How to erase and reformat SD card to ext3 on my macbook to prepare it for my raspberry pi I'm trying to reformat my 32G SD card to prepare it for my raspberry pi. My GUI program on my mac does not allow me to format it to ext3 which is what i'm told to reformat it to for my raspberry pi. 

How do I reformat this SD card to ext3. I've researched some links on how to do it from the command line but i'm having a hard time understanding the procedures. Is there a GUI program out there that will do this for me or will i need to do it from the command line.

I've tried using fdisk but i can't figure out what commands I need to add on to erase and format to ext3. I know the path and name of my SD card which is /dev/disk1s1 so that is no problem. 

I've also tried using the GUI program SDFormatter which is located here (https://www.sdcard.org/downloads/formatter_4). But I doubt this will reformat it to the format I want which is ext3. 

It takes some time to write a Linux distro to my SD card so I would like to get this right. Otherwise I wait for 2 hours for the writing process to complete plug in the SD card and then start up my pi and notice it doesn't work. I would like to stay away from making this time consuming mistake another time.
Install e2fsprogs brew install e2fsprogs
Format disk sudo $(brew --prefix e2fsprogs)/sbin/mkfs.ext3 /dev/diskN