Gentle people, I am getting this message, "Your bootable USB drive could not be created," when I try to set up a bootcamp installer, in Bootcamp Assistant. I have a 2017 iMac "27 inch. I am using 32 gb USB 3.0 drive, formatted in MS-DOS (FAT) with a "Master Boot Record" scheme. I understand (from various internet searches) that this message was common a few years ago, when people were working from CD installers. But I am working from an ISO downloaded directly from Microsoft. I did try an experiment, and I can get Parallels to install. But I do need Windows to boot in Bootcamp. If anyone has any tips, I'd be grateful. Also, I think this is my 100th MacRumors post! Woohoo!