Before that, let me guess the reason why do you want to format the external hard drive for Mac.
First reason- Maybe you want to delete everything from that drive and rebuilding the file system so that you can use it with an Operating System.
Second Reason- You want to get rid of viruses.
Third Reason- You have recently purchased a disk, and it is windows compatible not the Mac.
Or there may be some other reasons, but these are the most common ones which force you to format USB drive Mac.
Why Format External Hard Drive Mac?
As I said already, there can be any reason to format USB on Mac, but we must know why formatting a USB drive is necessary or recommended.
Most of the people in the world run Windows on their computers and Windows uses a different file system, usually one known as Fat32.
Although Mac can easily read from and write to other filesystem formats, including Windows MSDOS, FAT, FAT32, ExFat, and NTFS formats, formatting it to be entirely Mac compatible filesystem(Mac OS Extended or APFS) is highly recommended, and necessary for Time Machine and to make disks bootable.
Drives formatted as other filesystems can work fine with macOS, but it’s not optimal and you’re more likely to run into problems than if you use macOS’ native format. So, if you’ve bought a USB drive that’s formatted as Fat32, or any other format other than Mac OS Extended or APFS, here’s how to format USB on Mac.
How to Format Flash Drive Mac with Disk Utility
Step 1: Connect the USB Drive to your Mac.
Step 2: select Applications>Utilities and then launch Disk Utility. Also, to open Disk Utility in your Mac just press the command + spacebar. It will start the Spotlight Search, now search for Disk Utility.
Step 3: The application will appear on the screen, with a list of available storage devices on the left and various disk management options on the right.
Step 4: Select your storage device from the list on the left.
Here, we have two options, the first one is the Name that you can set for your USB Drive. The second one is the Format. Recommended format is Mac OS Extended as it is Mac compatible.
Step 5: Now, just click on the Erase Button to complete the format. Depending on the size and speed of your USB drive, it may take a minute or two.
Congratulations. Your USB drive is formatted.
So that’s your tutorial, how to format USB on Mac. Follow these steps while formatting your external hard drive. I hope this post was helpful to you. If you got some problems, then tell us in the comments.