Bootcamp: "Your bootable USB drive could not be created"

NervousFish2

macrumors regular
Original poster
Mar 23, 2014
202
280
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!
 

Nermal

Moderator
Staff member
Dec 7, 2002
18,815
1,296
New Zealand
Some ISOs work and others don't; I had one from MSDN and it wouldn't accept it. As far as I can tell you need to use a "normal" ISO if you aren't already.
 

Nermal

Moderator
Staff member
Dec 7, 2002
18,815
1,296
New Zealand
Both versions should work, as far as I'm aware. In fact, I think on some machines you need the 64-bit version.

Those are normal ISOs so it's not the same problem that I ran into. Maybe Boot Camp needs an update to handle the 1804 version...
 

Demigod Mac

macrumors 6502a
Apr 25, 2008
792
243
Definitely stick with 64-bit. 32-bit will cap memory usage to 4 GB.

If you can borrow someone's Windows PC for a moment, I'd suggest using Microsoft's Windows 10 Media Creation tool to make the USB installer instead of going the ISO route.
 

NervousFish2

macrumors regular
Original poster
Mar 23, 2014
202
280
Definitely stick with 64-bit. 32-bit will cap memory usage to 4 GB.

If you can borrow someone's Windows PC for a moment, I'd suggest using Microsoft's Windows 10 Media Creation tool to make the USB installer instead of going the ISO route.
Thanks. Will do!
 
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