For example, you can only store files that are less than 4GB on the device. This file format is highly compatible but somewhat limiting. This file format is compatible with multiple devices, like PCs and gaming consoles. If you plan on using your USB on both Windows and macOS devices, the preferred format is ExFAT. Different File System Formats Available in Disk Utility ExFAT Let’s look at how to format your thumb drive for a Mac. Unless it’s specifically designed to work on a macOS, you'll need to reformat the flash drive. It’s because most computers run on Windows and most thumb drives ship with formats that favor a Windows environment. Have you ever tried to use a USB drive on your Mac only to realize you couldn’t write any files to it?
