My question is WHY would you want to?
Just use boot camp.
Either on a ppc or intel mac, if you hold down the option key and start the mac and you have either more than one partition ie. os/9 and os /x or you have a bootable cd/dvd in the drive you will get the boot target drive menu.
Its part of the firmware not the os or bootcamp, I think some people think that bootcamp acts as somekind of bootloader, from my understanding of it , it is just a wizard that creates the harddrive partitions and installs the control panel applet in windows. wow.. big deal.
The big DEAL here if your looking for why this works now when it could only be done via a hack a few weeks ago it the FIRMWARE UPDATE, it modified the EFI modules to work with legacy bios .
ITs really pointless to try to setup windows outside bootcamp unless you want to do something like a tri-boot, or boot vista (why I will never know) or something.
  • Mar 12, 2016 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.
  • Install Windows 10 on Mac Without Boot Camp. Once you have created a bootable USB flash drive for Windows, then download the “Boot Camp driver” for Windows. For the first time when you install Windows on Mac, so the “Internet, sound, graphics, and other.
  • Dual Boot Windows 10 and Mac OS on PC without Erasing Windows. To start off, you will need a disk partition utility to help you allocate the required space. A free tool like MiniTool Partition Wizard Free Edition is more than adequate. Once you have the software, follow the steps shown below.

Right-click in Windows with Boot Camp on Mac. In Windows on your Mac, you can do a secondary click, or right-click, using an Apple Mouse, Magic Mouse, or trackpad. Apple Mouse or Magic Mouse: Click the upper-right corner of the mouse. Trackpad: See Set trackpad options in Windows with Boot Camp.

Apr 12, 2006 6:35 AM

What you need to install Windows 10 on Mac

  • MacBook introduced in 2015 or later
  • MacBook Air introduced in 2012 or later
  • MacBook Pro introduced in 2012 or later
  • Mac mini introduced in 2012 or later
Dual Boot Windows With Mac Os Sierra Without Boot Camp
  • iMac introduced in 2012 or later1
  • iMac Pro (all models)
  • Mac Pro introduced in 2013 or later

The latest macOS updates, which can include updates to Boot Camp Assistant. You will use Boot Camp Assistant to install Windows 10.

64GB or more free storage space on your Mac startup disk:

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  • Your Mac can have as little as 64GB of free storage space, but at least 128GB of free storage space provides the best experience. Automatic Windows updates require that much space or more.
  • If you have an iMac Pro or Mac Pro with 128GB of memory (RAM) or more, your startup disk needs at least as much free storage space as your Mac has memory.2

An external USB flash drive with a storage capacity of 16GB or more, unless you're using a Mac that doesn't need a flash drive to install Windows.

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A 64-bit version of Windows 10 Home or Windows 10 Pro on a disk image (ISO) or other installation media. If installing Windows on your Mac for the first time, this must be a full version of Windows, not an upgrade.

  • If your copy of Windows came on a USB flash drive, or you have a Windows product key and no installation disc, download a Windows 10 disk image from Microsoft.
  • If your copy of Windows came on a DVD, you might need to create a disk image of that DVD.

How to install Windows 10 on Mac

To install Windows, use Boot Camp Assistant, which is included with your Mac.

1. Use Boot Camp Assistant to create a Windows partition

Open Boot Camp Assistant, which is in the Utilities folder of your Applications folder. Then follow the onscreen instructions.

  • If you're asked to insert a USB drive, plug your USB flash drive into your Mac. Boot Camp Assistant will use it to create a bootable USB drive for Windows installation.
  • When Boot Camp Assistant asks you to set the size of the Windows partition, remember the minimum storage-space requirements in the previous section. Set a partition size that meets your needs, because you can't change its size later.

2. Format the Windows (BOOTCAMP) partition

When Boot Camp Assistant finishes, your Mac restarts to the Windows installer. If the installer asks where to install Windows, select the BOOTCAMP partition and click Format. In most cases, the installer selects and formats the BOOTCAMP partition automatically.

3. Install Windows

Unplug any external devices that aren't necessary during installation. Then click Next and follow the onscreen instructions to begin installing Windows.

4. Use the Boot Camp installer in Windows

After Windows installation completes, your Mac starts up in Windows and opens a ”Welcome to the Boot Camp installer” window. Follow the onscreen instructions to install Boot Camp and Windows support software (drivers). You will be asked to restart when done.

  • If the Boot Camp installer never opens, open the Boot Camp installer manually and use it to complete Boot Camp installation.
  • If you have an external display connected to a Thunderbolt 3 port on your Mac, the display will be blank (black, gray, or blue) for up to 2 minutes during installation.

How to switch between Windows and macOS

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Restart, then press and hold the Option (or Alt) ⌥ key during startup to switch between Windows and macOS.

Learn more

If you have one of these Mac models using OS X El Capitan 10.11 or later, you don't need a USB flash drive to install Windows:

  • MacBook introduced in 2015 or later
  • MacBook Air introduced in 2015 or later3
  • MacBook Pro introduced in 2015 or later3
  • iMac introduced in 2015 or later
  • iMac Pro (all models)
  • Mac Pro introduced in late 2013

To remove Windows from your Mac, use Boot Camp Assistant, not any other utility.

For more information about using Windows on your Mac, open Boot Camp Assistant and click the Open Boot Camp Help button.

1. If you're using an iMac (Retina 5K, 27-inch, Late 2014) or iMac (27-inch, Late 2013) or iMac (27-inch, Late 2012) with a 3TB hard drive and macOS Mojave or later, learn about an alert you might see during installation.

2. For example, if your Mac has 128GB of memory, its startup disk must have at least 128GB of storage space available for Windows. To see how much memory your Mac has, choose Apple menu  > About This Mac. To see how much storage space is available, click the Storage tab in the same window.

3. These Mac models were offered with 128GB hard drives as an option. Apple recommends 256GB or larger hard drives so that you can create a Boot Camp partition of at least 128GB.