Mac vs Windows. Windows vs Mac. Why choose if you can get the best of both worlds by dual booting? Install Windows on Mac so you can jump back and forth from one operating system to another on the same computer.

By now, the practice is well-established and Windows can work on Mac well. In this article, we’ll have a deep look at installing Windows on Mac. Don’t worry, we’ll have your back the whole way through!

Boot Camp for Mac vs virtualization software

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If you want to install Windows on your Mac, you have two options. You can either use Mac Boot Camp, a native feature of the macOS operating system, or you can use a third party virtualization program. Both methods have their own pros and cons, so let’s dive in.

Boot Camp is built into the operating system of all Macs. If you go to your Applications > Utilities folder, you’ll see the Boot Camp Assistant app. It makes the separate partition on your hard drive for installing and running Windows. Once Windows is installed in Boot Camp, every time you turn on your Mac, you will be asked to choose the operating system you want to run. This means that in order to switch from macOS to Windows, you need to reboot your computer.

Advantages

• built into your operating system
• easy to use — Boot Camp Assistant guides you through the installation process
• puts less strain on your Mac’s memory and processing power
• completely free (not Windows of course)
• easy to update

Disadvantages

• you need to reboot your computer to switch between the systems
• transferring data between operating systems isn’t easy

Virtualization programs are third-party applications that allow to install a separate operating system on one machine. They run like any other app on your Mac, so you can see the entire Windows desktop within a window on your computer.

Among the most popular virtualization programs are VirtualBox, Parallels, and VMware. Each one has its peculiarities, but we’ll try to sum up what they have in common.

Advantages

• you can run both operating systems at the same time
• easy file integration between systems

Disadvantages

• you need at least 8 GB of RAM for Mac to run smoothly
• virtualization apps are not cheap
• updates are not free

Depending on your specific needs, you can choose the option that works best for you. But we suggest using Boot Camp. It’s a free native feature of your operating system, running directly on your hardware. Therefore, it will be faster than any other method. And below, you’ll find all information on how to run Boot Camp on your Mac.

How to use Boot Camp: Preparing your Mac

1. Check the system requirements

Some versions of Windows require a certain processor and more hard drive space than the others. Therefore, you have to check the documentation that came with your copy of Windows to learn what you need.

You also need to make sure that your Mac is compatible with the version of Windows you want to install. For instance, Windows 10 is supported on these models:

• MacBook (2015 and later)
• MacBook Pro (2012 and later)
• MacBook Air (2012 and later)
• iMac (2012 and later)
• Mac Mini (2012 and later)

2. Clean up your hard drive

You need to have at least 55 GB of free disk space on your startup drive for installing Windows on a Mac. And if you don’t feel like spending the next several hours cleaning your Mac manually, you can use a powerful utility CleanMyMac X to find and remove all the junk from your startup disk.

CleanMyMac has everything to finish the 3-hour task of cleaning your hard drive in less than 5 minutes. It will scan every inch of your system and remove gigabytes of junk in two clicks. By the way, CleanMyMac finds about 75 GB of junk on average — more than enough for a smooth Windows installation.

Here’s how to clean your Mac with CleanMyMac X:

1. Download CleanMyMac here.
2. Run the app and click Scan.
3. Click Run.

That’s it! Gigabytes of junk are gone from your computer forever.

3. Back up your Mac

Finally, you should also perform a backup of your Mac in case something goes wrong. Although, it happens very rarely, it’s always better to back up your important data. There are a few methods of backing up your Mac, so choose the most convenient one for you.

You can make automatic backups with Time Machine — software that comes with your Mac. It backs up all data, so you can recover individual files or your entire system from your backups. You may also store files in iCloud and access them whenever you need. iCloud comes with 5 GB of free storage but you can upgrade it any time. If you have an external storage device, you can copy some files and folders on it.

We do recommend you to back up your Mac before installing Windows as it minimizes the chance of losing important data.

How to Install Windows with Boot Camp

Here’s how to install Boot Camp. The installation can be a little time consuming, but it is by no means difficult. Check out the details below.

Step 1: Get a Windows disk image

First of all, you need to get the Windows disk image (ISO file) from the Microsoft website. Here’s how to download it:

1. Visit the Windows 10 disk image download website.
2. Go to the Select edition menu and choose Windows 10.
3. Click Confirm.
4. Choose the language of installation and click Confirm.
5. Click 64-bit Download and then click Save.

The ISO file now will be downloaded to your Mac.

Step 2: Open Boot Camp Assistant

Boot Camp Assistant guides you through installing Windows on your Mac. You just have to follow the onscreen instructions. To launch the Boot Camp Assistant, go to Applications > Utilities folder. Click continue and Boot Camp for Mac will automatically locate the ISO file on your system.

Step 3: Create a partition for Windows

When you are done with the Assistant, your Mac restarts to the Windows installer. When you are asked where you want to install Windows, choose the BOOTCAMP partition and click Format.

*Note that this step is only required if you’re using a flash drive or optical drive to install Windows. In other cases, the right partition will be selected and formatted for you automatically.

Step 4: Install Windows

To finish the installation, you have to follow the onscreen instructions. Take a long breath — the next 12 steps may seem like climbing Everest, but it’s much easier than you think. Here’s how to install Windows on a Mac:

1. Choose your ISO file and click the Install button.
2. Type your Password and click OK. You will see the Windows Setup screen.
3. Select your language.
4. Click Install Now.
5. Type your product key if you have it. Otherwise, click 'I don’t have a product key'.
6. Select Windows 10 Pro or Windows Home and then click Next.
7. Click Drive 0 Partition X: BOOTCAMP.
8. Click Next. Windows 10 will be installed.
9. When the Setup screen appears, click either Use Express Settings or Customize Your Installation. We recommend you to choose the Customize button and disable most, if not all of the switches.
10. Then you’ll be asked to create an account. Type a username. You can also add a password if you want.
11. Click Next.
12. Choose whether you want to use the Cortana personal assistant or not. You can disable it by clicking Not Now button.

Windows will boot fully so you can use it normally.

On the Welcome to Boot Camp Installer box, click Next and accept the terms in the license agreement. Then click Install to proceed. When the installer completes, click Finish to reboot your machine.

Step 5: Restart your Mac

By default, your Mac will still boot to macOS. To access Windows, you have to turn your Mac off and then turn it on while holding the Option (Alt) key. You will be asked from which drive you’d like to boot.

Note that while in Windows, the Mac’s Command key functions as the Windows key, while the Option key functions as the Alt key. If you have a Touch Bar, you’ll see a complete set of buttons, similar to the Control Strip in macOS.

How to remove Windows from your Mac

If for some reasons you don’t need Windows anymore, you can permanently remove it from your Mac. Follow these steps:

1. Boot into macOS, launch Boot Camp Assistant and click Continue.
2. Choose 'Remove Windows 7 or later version' or 'Remove Windows 10 or later version'.
3. Click Restore when you see the Restore Disk to a Single Volume option.

The Boot Camp Assistant will automatically remove Windows from your Mac.

Warning: All data, including software and files, stored on the Windows partition will be deleted, so make the backup copies first.

That may seem like a lot of steps, but it doesn’t take all that long to install Windows on a Mac. Now you can enjoy two operating systems and switch between them right when you need. Cheers!

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NOTE:

Between mid October 2019 and mid February 2020 everyone in the Army was migrated to use their PIV Authentication certificate for Email access. You no longer use the Email certificate for Enterprise Email or any CAC enabled websites

Mac users who choose to upgrade (or already have upgraded) to Mac OS Catalina (10.15.x) will need to uninstall all 3rd Party CAC enablers per https://militarycac.com/macuninstall.htm AND reenable the built in smart card ability (very bottom of macuninstall link above)

If you purchased your Mac with OS Catalina (10.15.x) already installed, you can skip the uninstall part above and follow the instructions below.

6 'high level' steps needed, follow down the page to make this a painless systematic process

1.	Is your CAC reader 'Mac friendly'?
2.	Can your Mac 'see' the reader?
3.	Verify which version of Mac OS you have
4.	Figure out which CAC (ID card) you have
5.	Install the DoD certificates
5a.	Additional DoD certificate installation instructions for Firefox users
6.	Decide which CAC enabler you want to use (except for 10.12-.15)

Step 1: Is your CAC reader Mac friendly?

Visit the USB Readers page to verify the CAC reader you have is Mac friendly.

Visit the USB-C Readers page to verify the CAC reader you have is Mac friendly.

'Some, not all' CAC readers may need to have a driver installed to make it work.

NOTE: Readers such as: SCR-331 & SCR-3500A may need a firmware update (NO OTHER Readers need firmware updates).

Information about these specific readers are in Step 2

Step 2: Can your Mac 'see' the reader?

Plug the CAC reader into an open USB port before proceeding, give it a few moments to install

Step 2a: Click the Apple Icon in the upper left corner of the desktop, select 'About This Mac'

Step 2b: Click 'System Report...' (button)

Step 2c: Verify the CAC reader shows in Hardware, USB, under USB Device Tree. Different readers will show differently, most readers have no problem in this step. See Step 2c1 for specific reader issues.

Step 2c1: Verify firmware version on your SCR-331 or GSR-202, 202V, 203 CAC, or SCR-3500a reader. If you have a reader other than these 5, Proceed directly to step 3

Step 2c1a-SCR-331 reader

If your reader does not look like this, go to the next step.

In the 'Hardware' drop down, click 'USB.' On the right side of the screen under 'USB Device Tree' the window will display all hardware plugged into the USB ports on your Mac. Look for “SCRx31 USB Smart Card Reader.” If the Smart Card reader is present, look at 'Version' in the lower right corner of this box: If you have a number below 5.25, you need to update your firmware to 5.25. If you are already at 5.25, your reader is installed on your system, and no further hardware changes are required. You can now Quit System Profiler and continue to Step 3.

Step 2c1b-SCR-3500A reader

If you have the SCR3500A P/N:905430-1 CAC reader,you may need to install this driver, as the one that installs automatically will not work on most Macs. Hold the control key [on your keyboard] when clicking the .pkg file [with your mouse], select [the word] Open

Step 3: Verify which version of MacOS do you have?

(You need to know this information for step 6)

Step 3a: Click the Apple Icon in the upper left corner of your desktop and select 'About This Mac'

Step 3b: Look below Mac OS X for: Example: Version 10.X.X.

Step 4: Figure out which CAC (ID Card) you have

(You need to know this information for step 6)

Look at the top back of your ID card for these card types. If you have any version other than the six shown below, you need to visit an ID card office and have it replaced. All CACs [other than these six] were supposed to be replaced prior to 1 October 2012.

Find out how to flip card over video

Step 5: Install the DoD certificates (for Safari and Chrome Users)

Go to Keychain Access

Click: Go (top of screen), Utilities, double click Keychain Access.app

(You can also type: keychain access using Spotlight (this is my preferred method))

Select login (under Keychains),and All Items (under Category).

Download the 5 files via links below (you may need to <ctrl> click, select Download Linked File As... on each link) Save to your downloads folder

Please know... IF You have any DoD certificates already located in your keychain access, you will need to delete them prior to running the AllCerts.p7b file below.

https://militarycac.com/maccerts/AllCerts.p7b,

https://militarycac.com/maccerts/RootCert2.cer,

https://militarycac.com/maccerts/RootCert3.cer,

https://militarycac.com/maccerts/RootCert4.cer, and

Double click each of the files to install certificates into the login section of keychain

Select the Kind column, verify the arrow is pointing up, scroll down to certificate, look for all of the following certificates:

DOD EMAIL CA-33 through DOD EMAIL CA-34,

DOD EMAIL CA-39 through DOD EMAIL CA-44,

DOD EMAIL CA-49 through DOD EMAIL CA-52,

DOD EMAIL CA-59,

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DOD ID CA-33 through DOD ID CA-34,

DOD ID CA-39 through DOD ID CA-44,

DOD ID CA-49 through DOD ID CA-52,

DOD ID CA-59

DOD ID SW CA-35 through DOD ID SW CA-38,

DOD ID SW CA-45 through DOD ID SW CA-48,

DoD Root CA 2 through DoD Root CA 5,

DOD SW CA-53 through DOD SW CA-58, and

DOD SW CA-60 through DOD SW CA-61

NOTE: If you are missing any of the above certificates, you have 2 choices,

1. Delete all of them, and re-run the 5 files above, or

2. Download the allcerts.zip file and install each of the certificates you are missing individually.

Errors:

Error 100001 Solution

Error 100013 Solution

You may notice some of the certificates will have a red circle with a white X . This means your computer does not trust those certificates

You need to manually trust the DoD Root CA 2, 3, 4, & 5 certificates

Double click each of the DoD Root CA certificates, select the triangle next to Trust, in the When using this certificate: select Always Trust, repeat until all 4 do not have the red circle with a white X.

You may be prompted to enter computer password when you close the window

Once you select Always Trust, your icon will have a light blue circle with a white + on it.

The 'bad certs' that have caused problems for Windows users may show up in the keychain access section on some Macs. These need to be deleted / moved to trash.

The DoD Root CA 2 & 3 you are removing has a light blue frame, leave the yellow frame version. The icons may or may not have a red circle with the white x

or	DoD Interoperability Root CA 1 or CA 2	certificate
DoD Root CA 2 or 3 (light blue frame ONLY)	certificate
or	Federal Bridge CA 2016 or 2013	certificate
or	Federal Common Policy CA	certificate
or	or	SHA-1 Federal Root CA G2	certificate
or	US DoD CCEB Interoperability Root CA 1	certificate

If you have tried accessing CAC enabled sites prior to following these instructions, please go through this page before proceeding

Clearing the keychain (opens a new page)

Please come back to this page to continue installation instructions.

Step 5a: DoD certificate installation instructions for Firefox users

NOTE: Firefox will not work on Catalina (10.15.x), or last 4 versions of Mac OS if using the native Apple smartcard ability

Download AllCerts.zip, [remember where you save it].

double click the allcerts.zip file (it'll automatically extract into a new folder)

Option 1 to install the certificates (semi automated):

From inside the AllCerts extracted folder, select all of the certificates

<control> click (or Right click) the selected certificates, select Open With, Other...

In the Enable (selection box), change to All Applications

Select Firefox, then Open

You will see several dozen browser tabs open up, let it open as many as it wants..

You will eventually start seeing either of the 2 messages shown next

If the certificate is not already in Firefox, a window will pop up stating 'You have been asked to trust a new Certificate Authority (CA).'

Check all three boxes to allow the certificate to: identify websites, identify email users, and identify software developers

or

'Alert This certificate is already installed as a certificate authority.' Click OK

Once you've added all of the certificates...
• Click Firefox (word) (upper left of your screen)
• Preferences
• Advanced (tab)
• Press Network under the Advanced Tab
• In the Cached Web Content section, click Clear Now (button).
• Quit Firefox and restart it

Option 2 to install the certificates (very tedious manual):

Click Firefox (word) (upper left of your screen)

Preferences

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Advanced (tab on left side of screen)

Certificates (tab)

View Certificates (button)

Authorities (tab)

Import (button)

Browse to the DoD certificates (AllCerts) extracted folder you downloaded and extracted above.

Note: You have to do this step for every single certificate

Note2: If the certificate is already in Firefox, a window will pop up stating: 'Alert This certificate is already installed as a certificate authority (CA).' Click OK

Note3: If the certificate is not already in Firefox, a window will pop up stating 'You have been asked to trust a new Certificate Authority (CA).'

Check all three boxes to allow the certificate to: identify websites, identify email users, and identify software developers

Once you've added all of the certificates...
• Click Firefox (word) (upper left of your screen)
• Preferences
• Advanced (tab)
• Press Network under the Advanced Tab
• In the Cached Web Content section, click Clear Now (button).
• Quit Firefox and restart it

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Step 6: Decide which CAC enabler you can / want to use

Only for Mac El Capitan (10.11.x or older)

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After installing the CAC enabler, restart the computer and go to a CAC enabled website

NOTE: Mac OS Sierra (10.12.x), High Sierra (10.13.x), Mojave (10.14.x) or Catalina (10.15.x) computers no longer need a CAC Enabler.

Try to access the CAC enabled site you need to access now

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Mac support provided by: Michael Danberry