This answer applies to Mac models where the following is true.
The Windows specifications are given below.
The macOS is version 10.13.2 (High Sierra).
I have made the following assumptions.
Below are the installation steps.
Download the latest Windows Support Software for your Mac. For the 2011 iMac, this software can be found at Boot Camp Support Software 5.1.5621. On my Mac, these files were downloaded to the ~/Downloads/BootCamp5 directory. This software can also be use with the Mac models given below.
- MacBook Air (11-inch & 13-inch, Mid 2011)
- MacBook Air (11-inch & 13-inch, Mid 2012)
- MacBook Pro (15-inch & 17-inch, Mid 2010)
- MacBook Pro (13-inch, & 15-inch, Early 2011)
- MacBook Pro (17-inch, Early 2011)
- MacBook Pro (13-inch,15-inch & 17-inch Late 2011)
- MacBook Pro (13-inch & 15-inch, Mid 2012)
- MacBook Pro (Retina, Mid 2012)
- MacBook Pro (Retina, 13-inch, Late 2012)
- MacBook Pro (Retina, 13-inch & 15-inch Early 2013)
- Mac Pro (Early 2009)
- Mac Pro (Mid 2010)
- Mac Pro (Mid 2012)
- Mac mini (Mid 2011)
- Mac mini (Late 2012)
- iMac (27-inch, Mid 2010)
- iMac (21.5-inch & 27-inch, Mid 2011)
- iMac (21.5-inch, Late 2011)
- iMac (21.5-inch & 27-inch, Late 2012)
Note: The Boot Camp Assistant can also be used to download the Window Support Software. Look for the "Action" pulldown on the Boot Camp Assistant menu bar. On my Mac, these files were downloaded to the ~/WindowsSupport directory.
Create a ExFAT formatted volume labeled "BOOTCAMP" on the 2nd, 3rd or 4th partition of the primary disk. If this volume already exists, then erase the contents.
Make sure the drive is using the GPT/MBR hybrid partitioning scheme. See my answer to the question "How to convert a drive from the GPT format to the hybrid GPT/MBR format when using High Sierra (macOS 10.13.2)" for a procedure that accomplishes this task.
User Semi has noted that the Boot Camp Assistant (BCA) will correctly GPT/MBR hybrid partition the drive. So, you may be able to the the BCA to partition the drive, then use the flash drive to install Windows.
Use the Disk Utility application to erase a 16 GB or larger flash drive. Choose the parameters shown in the image below.
Mount the Windows iso file and copy the contents to the "BOOTCAMP" volume. In my case, the label "ESD-ISO" was used to identify the Windows iso. To perform the copy operation, you will need the enter the cp command from a Terminal application window. Below are the commands I usually enter. If necessary, make the appropriate modifications.
cd /Volumes/BOOTCAMP
cp -Rv /Volumes/ESD-ISO/ $PWD
Note: This command will take a while to complete. Be patient!
Copy the Windows Support Software to the "BOOTCAMP" volume. Below is the command I usually enter. If necessary, make the appropriate modifications.
cp -Rv ~/Downloads/BootCamp5/ $PWD
Use the command shown below to rename the AutoUnattend.xml file.
mv AutoUnattend.xml NoAutoUnattend.xml
Copy the contents of the "BOOTCAMP" volume to the "WINSTALL" volume. Below is the command to use.
cp -Rv $PWD/ /volumes/WINSTALL
Disable the ability to EFI boot from the "BOOTCAMP" volume. This can be accomplished by entering the command shown below. This will rename the folder containing the EFI boot files.
mv efi noefi
Next, you need to boot from the flash drive. Hold down the option key immediately after restarting your Mac. Release the option key when the Startup Manager window appears. Select the icon labeled "EFI boot". Next, select the arrow below the "EFI boot" label.
Open a Windows Command Prompt window by pressing shift+F10. The result should be similar to the image shown below.
Use the commands diskpart and bootsect to make the "BOOTCAMP" volume BIOS bootable. The commands you need to enter are given below.
Note: Sometimes it can take a while for the diskpart command to produce the first prompt. Be patient.
diskpart
list disk
You should see output similar to what is shown below. If there is a * character in the Gpt column for the Disk 0 entry, then you have not successfully converted the internal drive to use the GPT/MBR hybrid partitioning scheme, as described in step 3. If there is a * character in the Gpt column for the Disk 1 entry, then you did not select "Master Boot Record" as the scheme in step 4.
Disk ### Status Size Free Dyn Gpt
-------- ------------- ------- ------- --- ---
Disk 0 Online 500 GB 0 B
Disk 1 Online 14 GB 0 B
If no * characters appear in the Gpt column, then proceed and enter the command given below.
list volume
From the output of the command list volume, determine the number (###) for the volume with the Label "BOOTCAMP". Also, determine the drive letter (Ltr) for this volume. In this example, I will assume the number is 1 and the letter is C. Your number and letter could be different. The next command selects this volume. If you determined a different number for the "BOOTCAMP" volume, then make the appropriate substitution.
select volume 1
The next sequence of commands mark the volume active (bootable) and then quit diskpart.
active
exit
The next command writes the boot code to the MBR and the "BOOTCAMP" volume. If you determined a different drive letter for the "BOOTCAMP" volume, then make the appropriate substitution.
bootsect /nt60 C: /mbr
Enter the command shown below to quit the Windows Command Prompt window.
exit
Press Escape or click the X button to close the Windows installer, then wait for your Mac to reboot.
You need to finish the installation of Windows 10. Hold down the option key immediately after your Mac turns on. Release the option key when the Startup Manager window appears. Select the icon labeled "Windows". Next, hold down the control key while choosing the circular arrow below the "Windows" label.
Once the installer opens, open a Windows Command Prompt window by pressing shift+F10.
Restart the Windows installation. The commands you need to enter are given below.
Note: Sometimes it can take a while for the diskpart command to produce the first prompt. Be patient.
diskpart
list volume
From the output of the command list volume, determine the drive letter (Ltr) for the volume with the Label "WINSTALL". In this example, I will assume the letter is D. Your letter could be different. The next command quits diskpart.
exit
Enter the command below to start the Windows installation. Again, if the drive letter, for the "WINSTALL" volume, is not D, then make the appropriate substitute when entering the command below.
setup /unattend:D:\NoAutoUnattend.xml
When asked: "Where do you want to install Windows?", proceed as follows. First select the "BOOTCAMP" partition. Next, click on the "Format" button. Finally, click on the "Next" button.
Proceed until you reach the screen where you are prompted for your region. For the 1709 version (OS build 16299.15) of Windows 10, your the screen will appear as shown below.
For other versions of Windows 10, the screen could appear different. As an example, the screen, for the 1507 version (OS build 10240) of Windows 10, would appear as shown below.
Note: At this point, prohibiting your Mac access to the internet is generally a good idea. For example, unplug any ethernet cables or disable Wi-Fi access that does not require encryption.
Next, press the control+shift+F3 keys to restart Windows 10 in Audit mode.
Note: An unusually long amount of time must pass before the desktop appears.
When desktop shown below appears, the Windows Support Software installer should automatically launch. If this does not occur, use the Windows File Explorer to open the Windows Support Software application named "Setup". This application can be found in the "BootCamp" folder on the "WINSTALL" drive. After the installer application completes, allow the computer to restart.
You will return to the Administrator's desktop. If the "System Preparation Tool" window is not displayed, then open the sysprep application found in the C:\Windows\System32\Sysprep folder. In this window, select "Shutdown" under the "Shutdown options", as shown below.
Note: Your screen may also include a window labeled "Boot Camp", which can be ignored.
Next, select "OK" to shutdown the Mac. At this point, you have completed the installation of Windows 10.
Note: If you prohibited your Mac access to the internet in an earlier step, you may now want to allow access before turning your Mac back on. In other words, plug in the ethernet cable or turn the Wi-Fi back on.
Next time you turn on your Mac, Windows will start in the "Out of the Box Experience" mode. This is basically the way a newly purchased PC starts up, when Windows 10 is already installed.
Note: When asked, be sure to select an Apple keyboard.
If asked, I can clarify any of the above steps.
