Next, just select the Erase button from the top bar which will cause a menu to appear with numerous customization options. To format USB drive on Mac using this method, all you need to do is plug in the USB device into your Mac and select it from the Disk Utility’s sidebar menu. Here's how to format a drive using a Mac - including how to format a drive for Windows and Mac so the contents can be read on both platforms, and what format to use for Time Machine. Start the Disk Utility, located under Applications Utilities. Connect the external drive or the USB drive to the MAC. Disk utility - the MacOS utility application can help you with this. All is set, then you can go ahead to format the drive on your Mac. Well, what is the best format for USB drive? How to choose the best format for USB drive? Before you try to choose the best format for your USB drive, you need to know what file system it is in. Before you use a new USB drive, you need to first format it. Nowadays, USB flash drive is widely used on various electronic devices due to its portability. Follow the tutorial below, you'll get everything covered. You may wonder how to reformat an external hard drive on Mac. However, the Mac OS does not allow you to write data to the drive. Yo just got a new external hard drive and want to use it on your Mac.