In a situation like this, you need to format your thumb drive to a suitable format to make it can be read and written on both Windows and Mac.Īll in all, when you want to use your thumb drive on Windows and Mac, you need to format the drive to a suitable file system that is compatible with both of these two operating systems. Perhaps, your computer at home runs macOS but other computers run Windows-based operating systems or vice versa. You use a thumb drive to store files to use them on your computer at home and in your computer/school/local library. Why Do You Need to Format a Thumb Drive for Mac and PC?