Boot drives can be hard drives, solid-state drives, optical drives (CD / DVD), removable storage media (flash drives, SD cards), or even floppies in the past. Depending on the purpose for which you want the boot drive, the adequate storage capacity for antivirus and security programs is of 1 GB, to install Windows you will need 8 GB and if you. Jan 13, 2021 Launch Disk Utility, located at /Applications/Utilities. In the Disk Utility sidebar, select the USB flash drive device. The device will likely have the name of the USB flash drive manufacturer listed. Do not select the volume located just underneath the device name.
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To troubleshoot an issue with Windows 10 (especially boot-related issues), it can be handy to boot into Windows 10 not installed on a Boot Camp partition. It is relatively straightforward to create a bootable USB Flash drive to boot to the Windows 10 installer and open up a DOS prompt for troubleshooting.
What is needed
- USB Flash drive (8 GB or larger recommended)
- Windows 10 Installer ISO for Windows 10
Preparation
All the preparation is done in macOS on the Mac that is having an issue booting Windows. It is important to use this Mac since it will be used to identify the correct Windows drivers.
USB Flash Drive
The USB Flash drive must be formatted as exFAT.
- Insert an 8GB or larger flash drive into a USB port on the Mac
- In Disk Utility, format the Flash drive as exFAT. Quit Disk Utility after this operation completes.
Boot Camp Driver
Open Boot Camp Assistant in the Utilities folder and download the current Windows Support Software from the “Action” dropdown in the menu bar. Save the Windows Support Software to your desktop or other location. Do not save directly to the USB Flash Drive.
Windows Install Media
Download the current install media from the Microsoft website. Windows will not be installed, but the install media will give access to the command line tools in Windows. Select the version of Windows that is closest to the version of Windows installed on the Mac (Windows 8, Windows 10). It does not matter what edition of Windows is used, since Windows is not going to be installed.
Create Recovery USB Flash Drive
To create the USB Flash drive, follow these steps:
- Mount the Windows ISO downloaded from Microsoft. To mount the ISO, double-click on the ISO in Finder.
- Drag all the files and folders from the mounted ISO to the USB flash drive.
- Drag the contents of the Windows Support Software to the USB flash drive.
- If there is not an AutoUnattend.xml at the top level of the drive (as shown below), download AutoUnattend.xml, unzip it, and add it to the drive. AutoUnattend.xml provides the location of the $WinPEDriver$ folder to load the drivers during boot.
- The 2018 MacBook Air (and potentially Macs after that) cannot load the IntelMEI driver and give a “Windows Setup could not install one or more boot-critical drivers. To install Windows, make sure that the drivers are valid, and restart the installation” message. On the USB flash drive, open the $WinPEDriver$ and remove the IntelMEI folder.
Once the flash drive has been created, it should look like this:
The $WinPEDriver$ folder is important because it contains the drivers for Windows to boot successfully from the USB flash drive and the hardware on that Mac.
Boot from the USB Flash drive
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To inject the drivers, the Mac must be booted from the USB flash drive.
- Insert the USB flash drive into an available USB port on the Mac
- Reboot while holding the Option key.
- Select EFI volume in the startup selector.
If Windows does not boot from the USB flash drive after showing the Windows logo, you may have to run the following command to tell the firmware to boot the Windows installer from the USB flash drive. This has been observed on the late-2014 Mac Mini but may affect other models as well. To set the variable:
- Disable SIP by booting to the recovery partition.
- Boot back to macOS and open Terminal. Run the following command and enter the admin password when prompted:
sudo nvram InstallWindowsUEFI=1
Insert the USB flash drive if it is not inserted, reboot, and select the EFI volume from the startup selector.
Note: the InstallWindowsUEFI variable is cleared at each reboot, so you will need to set it again if you do not select the USB Flash Drive.
Command Prompt and Mapped Drives
When Windows 10 starts up, it will prompt for installation of Windows 10. To open a DOS window, press fn-Shift-F10 (or just shift-F10) or click Repair Computer->Troubleshoot->Command Prompt (if available).
Once in the command prompt, there are usually 3 drive letters available: X, C, and D.
- X: This is Windows that you are booted into in memory. The files from the boot.wim on the flash drive are copied to memory and then booted to
- C: Boot Camp partition
- D: The USB Flash drive
Running Utilities
Within the Windows command prompt, you can run utilities on the Boot Camp partition.
Video
Are you constantly getting error messages like 'There is not enough space available on disk' whenever using Boot Camp Assistant to create a bootable Windows 10 USB on your Mac? If you are a Mac user, you know that installing Windows 10 isn't as straightforward as many people may think and Boot Camp Assistant can be a challenge especially when creating a bootable Windows USB installation USB.
Fortunately, I got some tips for you. In this article, I will show the common fix this issue and recommend a good alternative to Boot Camp Assistant if it fails again.
Why Making a Bootable Windows 10 USB on Mac ?
When you have a bootable Windows USB, you can easily conduct repairs or make installations on Windows-based computers. It will give you a portable installation drive, and you can access it wherever you are, simply by saving it to a USB flash drive with enough space for the right Windows ISO file.
When you create a bootable USB like this, you will benefit from its portability, convenience, and speed. This is why it is a great option for IT administrators who work daily in a Windows environment. It will come into handy whenever a user faces a repair-related or installation problem.
How to Create Windows 10 Install USB via Boot Camp Assistant
You can actually create bootable USB installer on your own and ditch the FAT32 altogether. If you can pull this off (I will show you how), you can easily let macOS do the partitioning for you while you sit back and relax.
Step 1: Download everything that you need including a legitimate copy of Windows and Apple's drivers.
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Step 2: Launch the Disk Utility and insert the USB drive.
Step 3: Mount the downloaded Windows ISO by double-clicking. Click and then drag to select the files you installed and copy them. Again, copy WindowsSupport folder to the root directory in the USB installer. Now your Windows 10 USB installation is ready.
Step 4: Once again launch the Boot Camp Assistant and click on Continue. On the next screen, assign the space to Windows partition. Click on Divide Equally and then click continue for the process to start. Input administrator password and then it will restart to begin Windows installer.
Your Mac will restart a few times before it installs all the drivers. Once you've successfully rebooted Windows, everything will work as expected.
How to Fix 'There is not enough space available on this disk' Error
You might come across this error when creating a bootable Windows 10 USB on Mac. It never appears on previous Windows version because the installation ISO is smaller than 4G. Mostly, this error pops up when using the Windows 10 ISO with October Update. Here are the common fix to get it solved.
Fix 1: Download Windows 10 original ISO instead of ISO files with updates.
Fix 2: Format the USB to FAT 32 or exFAT (Mojave).
Best Boot Camp Assistant Alternative to Create Windows 10 Install USB
Most users opt for UUByte ISO Editor to create bootable media and burning ISO files if Boot Camp Assistant failed. It gives them the flexibility to be able to change their burn settings and choose their storage medium. It can be used in both UEFI boot and legacy BIOS schemes as well as with multiple file systems.
The most important features are the high burn success rate and the simple UI that allows even novice users to quickly burn bootable ISO file to an USB flash drive. These features have made UUByte ISO Editor extremely popular among both Windows and Mac users around the world. In a matter of a few steps, anyone can create a bootable USB drive for Windows 10/8/7. The process has been described in details below:
Step 1: Install UUByte ISO Editor on Mac
Download the UUByte ISO Editor into your Mac Computer. Once you have completed the task, type the password before you open the application in order to authorize the permission.
Step 2: Insert USB into Mac
Plug in the USB flash drive into the Mac. The application home page will show multiple options as you launch the software. By clicking on 'Burn,' you will be creating the bootable disk.
Step 3: Create Bootable Windows 10 USB on Mac
Now in the next Window, you need to add the Windows ISO to the program by clicking the Browse button at the top. Select the Windows 10 ISO file and then choose the appropriate storage medium. Click on the 'Burn' button and wait for a few moments to create the bootable drive. You can start using it for installing Windows afterwards.
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The good thing about this application is that there are no 'Advanced' settings to confuse the user and no additional tools needed to complete the task. The software does the formatting on its own and does not require the users to complete complex and lengthy tasks.
Conclusion:
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The best tools are those that help people to fix problems with minimal effort. UUByte ISO Editor is wildly popular among Mac users. It has a high rate of burn success, and the UI is simple, making it possible even for the novice users to make bootable ISO files quickly to a USB flash drive or a disc.