Installing Windows 10 on a Mac without Bootcamp

Installing Windows on a Mac should be a piece of cake with Bootcamp, but that rarely is the case. In fact, I would personally say that Boot Camp Assistant is one of the worst apps that comes with OS X and unlike the rest, it doesn’t work seamlessly.

A few of its drawbacks:

• It only supports a drive with a single partition.
• It often throws very obscure error messages with limited detail.
• It re-downloads 1.6 GB Windows drivers every single time it runs. These are placed under /Library/Application Support/BootCamp/WindowsSupport.dmg and deleted and re-downloaded each time Boot Camp Assistant starts processing.

This post did take a lot of work to complie and I did bone my hard drive a few times while trying certain ideas, so please throw out a thanks if it helped you out 🙂

Disclaimer: This guide below contains procedures which can potentially destroy your partitions and data. I accept no responsibility for such loss so please proceed at your own risk.

Update (2016-07-20): I have updated this post with further improvements relating to downloading of Boot Camp drivers and ensuring that a Hybrid MBR is not used (which would cause issues when installing Windows).

What You Will Need

• An 8 GB or larger USB stick
• A copy of the Windows 10 ISO
• A valid Windows 10 license
• A downloaded copy of unetbootin

Downloading Boot Camp Drivers

1. Start Boot Camp Assistant
2. Select Action / Download Windows Support Software
3. Choose your Downloads directory, enter your password and then click Save

This will be the only step that we will use Boot Camp Assistant for.

Creating a Bootable USB Windows 10 Installer

Formatting Your USB Stick

Attach your USB stick and start Disk Utility, select your USB drive in the left panel under External, click Erase and set the options as follows (exactly) and click Erase:

Name: FAT32
Format: MS-DOS (FAT)
Scheme: Master Boot Record

Turning Your USB Stick into a Windows Installer

Open unetbootin, enter your password, set the options as follows and click OK:

Diskimage: checked, set to ISO and browse to your Windows 10 ISO
Type: USB Drive
Drive: Your USB drive (you should only see one entry here)

If you see more than one drive listed, you may confirm which is your USB drive by opening the Terminal and typing:

You’ll see your USB drive in the output and it should look something like this:

Once you have kicked off unetbootin, grab a snack while the Windows ISO is copied to the USB stick. This process takes around 15 minutes to complete.

Finishing Up

When this has completed, you may right click on the USB stick in Finder, select Rename “FAT32” and rename it as you like (I’ll call mine “WINDOWS 10”).

Finally, copy the WindowsSupport in your Downloads directory to the Windows 10 USB stick so it’s easy to get to after our installation.

Partitioning Your Drive

In Disk Utility, select your internal hard drive on the left panel, and click on Partition.

Click the + button and create a new partition of your desired size for your Windows installation and name it as you wish (I’ll call mine “BOOTCAMP”). Ensure that the Format is set to MS-DOS (FAT) and click on Apply.

Ensuring that a Hybrid MBR is not used

Huge thanks to Rod’s post from the superuser post titled Windows detects GPT disk as MBR in EFI boot.

Once you add a FAT32 partition with either Boot Camp Assistant or Disk Utility, your disk is converted into a hybrid GPT / MBR disk which is actually not supported by newer versions of Windows. In this step, we revert this additional change made by Disk Utility by switching back to a pure GPT partition table.

1. Dowload the latest version of GPT fdisk by browsing to the version, then gdisk-binaries and clicking the file with the *.pkg extension (e.g. gdisk-1.0.1.pkg).
2. Install GPT fdisk by running the installer you downloaded

Open a Terminal and check the state of your MBR

If your MBR partition is set to hybrid, please continue with step 4, otherwise if it is set to protective, you may skip the rest of this section. Simply type q and hit return to exit GPT fdisk.

Type p to view the existing partition table and verify you’re working on the correct disk

Type x to enter the expert menu

Type n to create a fresh protective MBR

Type w to save your changes and confirm the change when asked

Type q to exit GPT fdisk

Run GPT fdisk to show your disk layout:

Your partition table should look something like this:

Installing Windows

Disconnecting All Devices From USB Ports

This step is critical as I have had rather serious problems during Windows installation when certain external drives are connected.

Unplug everything from your Mac except your keyboard (if wired) and your bootable Windows USB stick (which we prepared earlier).

If your Mac contains multiple physical drives, you will need to disconnect all disks except the one which you intend to install Windows on or you may encounter the following error:

Windows could not prepare the computer to boot into the next phase of installation. To install Windows, restart the installation.

Booting From the USB Stick

Ensure that the USB stick containing the Windows installer is inserted and then restart your Mac while holding down the option (alt) key.

You should now be presented with a list of bootable drives. Select the USB drive (usually titled “EFI Boot”) to begin installing Windows.

Correcting Your Windows Hard Disk Partition

When you are asked Where do you want to install Windows?, select the Windows partition created earlier (which I called “BOOTCAMP”) and click Delete.

Next, select the chunk of Unallocated Space and click on New to create a proper Windows NTFS partition.

Note: OS X only supports creation of FAT filesystems, so this is why we need to re-create the partition ourselves during install.

Completing the Installation

Allow the installer to complete and boot into Windows.

Installing Boot Camp Support Software

Once Windows is up and running, install the Boot Camp Support software running WindowsSupport/BootCamp/Setup.exe on your USB stick.

Note: The installer takes a little while to show up, so please be patient.

You may encounter a known issue whereby the Boot Camp Support Software installer locks up while installing Realtek audio.

If this occurs, you will need to open Task Manager and kill the RealtekSetup.exe process.

After the installer has completed, answer No when prompted to reboot and install the Realtek drivers manually by running %USERPROFILE%\AppData\Local\Temp\RarSFX0\BootCamp\Drivers\RealTek\RealtekSetup.exe. If you can’t find this file, check any other directories starting with RARSFX under %USERPROFILE%\AppData\Local\Temp.

Once complete, reboot Windows.

What You Will Need to Configure Windows

• The latest version of SharpKeys
• The flipflop-windows-sheel binary (see README for a download link)

Configuring Windows

Mapping Your Mac Keyboard

Install and run SharpKeys and then configure the following mappings to correct your Mac keyboard so that it behaves like a regular Windows keyboard:

Function: F13 -> Special: PrtSc
Special: Left Alt => Special: Left Windows
Special: Left Windows => Special: Left Alt
Special: Right Alt => Special: Right Windows
Special: Right Windows => Special: Right Alt

Note: for F13, you’ll need to select Press a key and click F13 on your keyboard.

Switching to Natural Scrolling

If you wish to flip scrolling direction to match that on OS X, run FlipWheel.exe and then click on Flip All.

Enabling Num Lock on Boot

Paste the following into a file named Enable NumLock on Boot.reg then import this into the registry to enable NumLock when Windows boots up (it doesn’t by default).

Completing Configuration

That’s it, give your machine one last reboot and you’ll have a fully working Windows 10 installation.

Note: I have found Apple’s Magic Mouse to be extremely unreliable using the Boot Camp drivers from Apple. As such, I recommend purchasing a Logitech (or similar) mouse for use in Windows. I have no trouble plugging the wireless receiver for my Logitech mouse into one of the USB ports of my wired Apple Keyboard and it’s so tiny that you can’t see it at all.

Cleaning up a Windows Installation

Removing the Windows Partitions

If you decide to remove Windows, you may find that Disk Utility doesn’t allow you to delete the two partitions that have been created by the Windows installer.

This happens due to the fact that the first small partition created is of a type called Microsoft Reserved which OS X’s Disk Utility doesn’t support.

The safest way to delete these partitions is through the Windows installer. So simply boot from your USB stick as we did before and when you reach the Where do you want to install Windows? question, you may delete your “BOOTCAMP” partition and the small 16 MB partition of type MSR (Reserved) just above the BOOTCAMP partition.

Once done, simply quit the installer by clicking the X in the top right corner of each Window and reboot back into OS X.

Removing the Boot Entry

Even though we have removed the Windows partition, a boot entry will still be present when holding down option (alt) during boot.

You may remove these items by running the following in your Terminal:

How to Create a Bootable USB Stick on Windows 10, 8, 7?

If you need to create a bootable USB stick on Windows, you can read through this page. It explains how to create a bootable Windows USB via CMD or a piece of free software.

By Emily / Last Updated April 15, 2021

Why make a bootable USB stick on Windows?

A bootable USB drive is an external hard drive that contains the operating system and can be used to boot a computer or laptop. Most users plan to create a bootable USB drive in Windows for the following three different purposes.

в—†Repair Windows PC: the most important one should be saving the PC when it cannot boot successfully due to a virus, serious system failure, defective hard drive, or other disk errors. With the bootable USB drive, you can reboot the computer and repair it accordingly.
в—†Clean install OS: it can be used as an external installation media to clean install the operating system. This is much quicker and easier than installing OS from CD or DVD-ROM.
в—†Bring your familiar OS everywhere: the bootable USB drive can also be a portable Windows device, which you can take everywhere and enjoy the familiar OS environment on other computers, even the brand-new one without OS installed.

How to create a bootable USB on Windows 10/8/7?

As listed above, the bootable Windows USB drive can be used under different situations, so the process of creating a bootable USB stick on Windows will also differ slightly. But don’t worry, this article will outline how to make a bootable USB device for the above 3 purposes on Windows 10/8/7.

Part 1. Create bootable Windows installation USB media via CMD

First of all, we will show you how to create a bootable USB drive for installing the OS.

Tips:
в—Џ The USB drive should be at least 4GB of storage (for a 32-bit operating system) or at least 8GB (for a 64-bit system).
в—Џ Back up files you have stored on the USB drive because the drive will be formatted during this process and all files on it will be erased.

Step 1. Open Command Prompt windows: click “Start” button, input “cmd” in the Search box and press “Enter”. Right click the “Command Prompt” icon and select “Run as administrator”.

Step 2. In the pop-out Command Prompt window, type “diskpart” and press “Enter” to launch Diskpart utility. Inside the Diskpart window, input the following commands in turn and press “Enter” after each one.

list disk

select disk #

clean

create partition primary

select partition 1

format fs=ntfs quick (if you plan to create UEFI bootable USB using Diskpart, type “format fs=fat32 quick” instead to format it into FAT32 file system)

active

exit

Don’t close the Command Prompt. You can minimize it for a little bit since the process is not finished yet. Now, put the Windows DVD into your computer’s DVD drive. Open Windows File Explorer to check out the drive letter of the Windows DVD drive and the USB drive.

Then, go back to the CMD window and type in “D: CD BOOT” (replace D: with your DVD drive letter) and press Enter. Type “CD BOOT” again and press Enter. Lastly, type “BOOTSECT.EXE /NT60 H: “ (replace your USB flash drive letter for H:) and press Enter.

At last, copy all the files and folders of the Windows DVD to your USB flash drive in File Explorer. Now, you can plug the bootable USB flash drive into the target computer to start installing OS.

Part 2. Create a bootable USB drive for Windows repair

If your Windows computer cannot boot due to hard drive failure, you can create a bootable USB drive as a Windows repair tool. In this case, you can use the free AOMEI Partition Assistant Standard .

Apart from creating a bootable USB stick on Windows computer for a PC emergency, it also offers related functions to repair boot issues such as rebuilding MBR, checking and fixing bad sectors on the system drive.В Now you can free download it and learn how to create a bootable USB stick on Windows 10/8/7 for Windows repair.

Step 1. Connect the USB drive to a working Windows computer, install and run AOMEI Partition Assistant Standard. Click “Make Bootable Media” and hit on “Next” to proceed.

Step 2. Choose the right USB drive under “USB Boot Device” and click “Proceed”.

Step 3. Then you will be told the USB will be formatted, please back up important data. If you have done that, click “Yes”.

Step 4. Then wait for the process to be completed.

Note: the bootable USB drive contains the pre-installed AOMEI Partition Assistant Standard.

When the process is done, insert the bootable USB drive into the computer with boot issues, change boot order in Boot menu to make it boot from the bootable USB stick. Then you can rebuild MBR on the system primary hard drive.

Or you can right-click the system partition to check whether there are some bad sectors on the partition and fix them if necessary. Those two functions are most commonly used functions to repair Windows boot failures.

Part 3. Create a bootable USB drive for portable Windows device

In addition to the above two purposes of uses, some users want to create a bootable USB stick on Windows to get a portable Windows USB drive. For this task, you can upgrade to Professional. It offers the “Windows To Go Creator” feature. Much like “Windows To Go” developed by Microsoft, but it is much more powerful and flexible.

It supports both certified and non-certified USB drive. It can create any edition of Windows 10/8/7 bootable USB no matter it is Enterprise, Education, Home or Professional. Besides, it allows you to make Windows 10/8/7 portable USB drive with and without Windows ISO files. Moreover, it does not a USB drive over 32GB, instead, 13GB is enough in most cases.

Step 1. Install and run AOMEI Partition Assistant Pro on your PC. Click “All Tools” > “Windows To Go Creator” on the left side.

Step 2. Select «Create Windows ToGo for personal computer». PS.: if you want toВ run Windows from USB on Mac, you can use the seond option.

Step 3. Choose «Create Windows ToGo with system disc/ISO» and click on «Next».

Step 4. Choose Windows ISO file in this window. Click “Next”.

Note: If you don’t have Windows ISO files, go for the second method to create Windows bootable USB with current system .

Step 5. Select USB drive and c lick on “Proceed” to start creating a bootable USB drive in Windows computer.

Final words

This article has shown how to create a bootable USB stick on Windows 10/8/7 for different usages. Be clear about your requirements and choose the right method. If you want to create a Server bootable USB drive for repairing Server computer or enjoying the customized Windows Server environment, you can try AOMEI Partition Assistant Server.