Your bootable disk or drive can't be created on a Mac unless you're familiar with Boot Camp Assistant or a similar utility that will allow you to create a USB installer for Windows 10. Since Mac does not natively support ISO (their own format for disk images is DMG), you need a special utility to burn an ISO to USB disk. Unfortunately, for Mac users, it can pose a problem because boot disks typically contain ISO disk image files that carry the necessary boot information for a Windows 10 installation. Part 1: Why Creating Windows 10 Bootable USB So Hard on Mac? Part 4: Make Bootable Windows USB without Bootcamp Part 3: Create Windows 10 Bootable USB with ISO Burner for Mac Part 2: Create Windows 10 Bootable USB with Mac Disk Utility Part 1: Why is So Hard to Create Windows 10 Bootable USB on Mac?