Boot Camp 'Your bootable USB drive could not be created' error

You are awesome. Great post, got me past this problem too. Thanks a million!

Make sure that the Windows ISO is unmounted.

To unmount: Open "Disk Utility" and under the drivers in the left sidebar you will see the windows iso. Right click on it and select "Unmount".

If iso file is still there, right click and simply press "Delete".

I have the ISO stored on a hard drive, when I used the ISO (Windows 7 x64) I get the same error as above but my disks in disk utility are unmounted, would it be the hard drive which is messing up? Any help would be greatly appreciated.

Same. I have tried everything - Switching Flashdrives (8G, 16G and 32G), Unmounting the iso file in Disk Utility, ect.

I have a brand new (less than a week old) imac that doesn't have a DVD drive so I can't burn the iso to a dvd and install this way.. Please help, I've been at this for days and am lost.

Finally figured it out after reading through these posts.. Thanks guys!!

I was trying to create the bootable USB using the Win7 ISO file that was stored on the USB..

All you need to do is move the ISO file somewhere onto your MacBook.. Then unmount the ISO using Disk Utilities and then run Boot Camp..

My USB was formatted to FAT32.. Not sure if it needs to be for it to work?

For me, the problem was my USB drive was the problem, not the ISO file. I went to disk utility and on the left I selected my USB drive. I went to erase, and changed the format to MS-DOS (FAT) and I went back to boot camp and retried it and it worked great!

I have the same problem. Then I find out the problem was the iso file. If you are using a torrent software like Utorrent to download the iso file. Make sure you must quick Utorrent before created an boot usb. Hope it work !

Thanks JacobGK. this worked perfectly, although I'm not sure why I had to move the iso image to the desktop this week. I had bootcamped another MacBook Air last week and it worked successfully with the ISO image on the USB. Anyway, thanks again, I'm off and running!

Hey, I'm getting the same error.

I just purchased Windows 8.1, and used the Media Creator tool from Microsoft to generate the media necessary for a flash drive install, and then created an ISO from that which was placed in my documents. However, even though I eject the ISO before selecting it in boot camp assistant, after it formats my other USB drive it mounts the ISO in disk utility again, causing the error message to display.

Please! Any help would be huge!

I kept getting the same error - listened to everyone else's advice with unmounting the image, trying a new flashdrive, etc - then realized that I was trying to mount the Boot Camp iso instead of the Windows 7 iso! 😝

I am having an issue trying to use bootcamp to install my windows 8.1 and it says that " your bootable usb drive could not be created" I don't know anything about computers and i don't know where to go for help

Yes!!! This worked for me as well! I was so scared because i just spent $135 on windows 8 and it wasn't working but now after deleting the files on the usb and just plugging it in, it started formatting my usb and its hopefully going to go to the stage where i partition my drives! Thanks for the help, you saved my *** big time!!!!!!

I tried with a Windows 10 iso that was free from microsoft the error messeage read "Boot Camp only supports 64-bit Windows installations on this platform. Please use a ISO file for 64-bit Windows installation." I especially made sure that I got the 64-bit version. Is there any problems with what I did or is there any solution to the problem. Please help I am hopeless with the apple OS X system thanks

zxck wrote:

I tried with a Windows 10 iso that was free from microsoft the error messeage read "Boot Camp only supports 64-bit Windows installations on this platform. Please use a ISO file for 64-bit Windows installation." I especially made sure that I got the 64-bit version. Is there any problems with what I did or is there any solution to the problem. Please help I am hopeless with the apple OS X system thanks

You downloaded an ISO which contains both 32-bit and 64-bit W10. Use your Product key to download a 64-bit only version. You should first in-place upgrade W7/8+ on your Mac which registers it with Microsoft. This will allow you unlimited re-installations on the same Mac.

1. If your ISO contains any single file larger than 4GB, it will not be copied to the USB.

2. If the USB is USB3, this error can happen, but is inconsistent across brands of USBs.

3. Changing the DMG to .iso and back is not going to make a difference.

4. Did this ISO come from Microsoft download?