mkudffs (a.k.a. mkfs.udf) on the whole block device, by default it uses --bootarea=erase, and results in a device that automounts on macOS, Windows 10, and GNOM

mkudffs (a.k.a. mkfs.udf) on the whole block device, by default it uses --bootarea=erase, and results in a device that automounts on macOS, Windows 10, and GNOME and KDE (at least). There is also --bootarea=mbr which sounds similar to what this script is doing but I'm not sure why it's necessary; maybe for older versions of Windows.