If you have files larger than 4 GB and mostly share with Windows PCs, choose NTFS. If you have files larger than 4 GB, but still want pretty good support across devices, choose exFAT. If you want to share your files with the most devices and none of the files are larger than 4 GB, choose FAT32. In the Volume Format: selection box, click.Click to select the USB storage device in the left panel.Open Disk Utility which can be found by opening:.Connect the USB storage device to the computer.WARNING: Erasing the USB device will delete all content on the device. To format a drive on a Mac, you’ll need the built-in Disk Utility application. Again, formatting a drive will erase it completely, so make sure you have everything backed up that you want to keep. If you want to use a different file system on your USB drive, you’ll need to “format” it. If you have an old flash drive or one that was formatted to work with Windows or another operating system, you can still format your flash drive to work on a Mac. You can use any USB flash drive on a Mac computer provided that it has been formatted.
