If not, you need to format it to a supported format in advance. When you get a new USB device/thumb drive/flash drive/pen drive and want to use it on your Mac computer, you need to make sure that the file system of the USB device is supported on your Mac.In many situations, you need to format a USB drive on Mac to meet your requirements: When Do You Need to Format a USB Drive on Mac?įormatting a USB drive on your Mac computer is a basic and simple operation. How to Recover Data from a Formatted USB Drive on Mac?.How to Format a USB Device on Your Mac Computer?.