If you never formatted a USB drive then don’t worry it is effortless.
So in this post, I will tell you “How to Format USB on Mac?”. Also when we buy a new USB or Hard Drive, it often comes with windows compatible not the mac so formatting it even needed in this case. And we usually perform formatting in our USB or External Hard Drive when we want to get rid of viruses, or we want to clean the disk as it was when we purchased it. Formatting in context of USB or Hard Drives means deleting everything from that drive and rebuilding the file system so that we can use it with an Operating System.