First you have to find the disk utility, you should be able to find it in the finder. If you can't find it in the finder you can simply search for it in the spotlight search bar in the upper right corner of the desktop.
Step2
On the left side there should be all the drives currently connected to your computer. The external drive can be identified by a yellow box icon and it's size.
Step3
Click on your external drive. Then click on the erase tab. Next to 'volume format' you can choose the format. For mac if your just going to use it for extra space on your mac, the I use MAC OS journaled.
Step4
Then name your drive whatever you want in order to identify it later. Then hit erase. Formatting on a mac takes much less time than on a PC so it will only take less than a minute.
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