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

in another thread following solution was given:

"A very simple solution: make sure the ISO file is not mounted when running the Boot Camp Assistant!"

Format it as shown..

put the file on ur USB drive. than put a duplicate of the windows file on your desktop.

when it comes to choosing the disk in bootcamp. go and choose the file on your desktop DO NOT CHOOSE THE FILE ON YOUR USB DRIVE. YOU SHOULD BE GOOD. GOOD LUCK

If the install.wim or boot.wim file on the ISO is larger than 4GB, then BCA does not copy the file to the USB since FAT32 file size limit is 4GB. This is usually the case when you have mixed 32-bit/64-bit ISO or multiple Windows variants in a single WIM file.

As a test Download Windows 10 Disc Image (ISO File) and use BCA and check if it works.

Thanks. I was putting the fact that I couldn't get Boot Camp Assistant to put Windows 7 onto an 8Gb flash drive down to Disk Utility on Sierra. After numerous failed attempts, I tried your solution. Things seem to be chugging along just fine now.

Strange thing is that I didn't even know the ISO file had been mounted until I saw your post. Thanks again.

we very often oversee the little obvious things, glad it solved it for you.🙂

how do I unmount a file?

how do I unmount a file?

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".

The disk “Win7.iso” could not be unmounted.

Make sure that all applications and files are closed on this disk.

What to do know?!

Solution:

1. Open "Disk Utility"
2. On the left side of programm, choose file with file extension ".iso"
3. Pull out all files with extension ".iso" (remove)
4. Close utility

That's it 🙂

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.

Still got the same as lee-bartlett, i deleted all .iso files @ disk utility.

Im still busy 2 days to install windows 7.

Please some help...

(im sorry for bad english).

Me too - same problem. Did you guys finally solve it? I´m stuck here, help appreciated!