Mac Boot Camp Your Disk Could Not Be Partitioned

When attempting to create a Windows partition, Boot Camp Assistant might show the alert ”Your disk could not be partitioned. An error occurred while partitioning the disk. Please run First Aid from within Disk Utility to check and fix the error.”

Mar 08, 2018  The disk image is the Windows ISO downloaded by BC Assistant. That is not your issue, but High Sierra is most likely the issue. Post the output of the following macOS Terminal command. Apple has come up with a well-arranged Mac Disk Utility interface that will make enlarging/resizing of a Mac Volume to be easy. Steps to Resize Mac Partition. If you want to know to resize Mac partitions using Mac Disk Utility, follow the steps below to learn to do it. Navigate through your menu and open Mac Disk Utility.

Use Disk Utility to check for errors

  1. Install the latest macOS updates.
  2. Use Disk Utility to repair your startup disk.
  3. If Disk Utility found no errors or repaired all errors, try again to use Boot Camp Assistant to install Windows.
  4. If Boot Camp Assistant still gives the partitioning error, continue to the steps below.

Check for unallocated free space

  1. Open Disk Utility, which is in the Utilities folder of your Applications folder.
  2. In the Disk Utility sidebar, select the name of your internal disk, container, or volume, such as Macintosh HD.
  3. Click Partition in the toolbar.
  4. If you see a message about Apple File System space sharing, click Partition to confirm that you want to partition instead of add a volume.
  5. If the pie chart shows a section labeled ”Free space,” click to select it. ”Free space” should now also appear in the Partition Information shown on the right.
  6. After selecting the ”Free space” section of the chart, click the remove (–) button beneath the chart. Removing this unallocated free space makes that space available for your use again. Then click Apply and quit Disk Utility.
  7. Try again to use Boot Camp Assistant to install Windows.
  8. If Boot Camp Assistant still gives the same partitioning error, continue to the steps below.

Turn off Time Machine temporarily

If you use Time Machine with macOS Mojave or High Sierra, either upgrade to macOS Catalina 10.5 or later, or follow these steps:

  1. Open Time Machine preferences from the Time Machine menu in the menu bar. Or choose Apple menu  > System Preferences, then click Time Machine.
  2. Deselect ”Back Up Automatically” to turn off Time Machine.
  3. Wait a few minutes, then try again to use Boot Camp Assistant to install Windows.
  4. After installation is complete, you can turn on Time Machine again.

Boot Camp Your Disk Could Not Be Partitioned

Learn more

Learn what to do if Boot Camp Assistant stops responding or says that Boot Camp installation failed.

If you own Intel-based Macs, you can run OS X and Windows on one machine. In fact, it’s been possible to run Windows on a Mac for some time — with agonizing limitations. Near-extinct Mac models were loaded with Virtual PC emulation software could do Windows, too, but the program was painfully slow. Even if you find an old copy of the software, it won’t work with any current Macs.

Boot Camp software from Apple shook up the computing public upon its apocalyptic arrival in April 2006. Boot Camp graduated from beta, or near-finished, status with the arrival of Leopard. Boot Camp Assistant software is stored in the Utilities folder inside the Applications folder.

Boot Camp itself is free. You have to supply your own single-disc or downloadable full-install version of Windows; an upgrade disc won’t cut it.

It’s also important to note that you can use a 64-bit version of Windows, Windows 7 (Home Premium, Professional, or Ultimate), Windows 8, or Windows 8.1. Consult Apple support to see which Mac models are compatible with which versions of Windows. In its current incarnation, Boot Camp isn’t compatible with 32-bit versions of Windows.

Other requirements follow:

  • An Intel Mac with OS X version 10.6 or later

  • At least 2GB of RAM and 20GB of available space on the Mac’s storage drive that you want to donate to Windows

  • A blank CD or USB storage device that you’ll use for Windows software drivers

If you don’t run into snags, the entire installation should take about an hour.

Windows 8 and Windows 8.1 are optimized for a touchscreen environment, though you can use it with a standard mouse and keyboard. For now, Macs don’t support touchscreen computing.

To install Windows 8 via Boot Camp, you still must have a legitimate Windows 8 license from Microsoft and a Win8 installation disc, assuming that you have an optical drive. If you don’t have an optical drive, you may be able to create a Windows installer from an ISO file downloaded from Microsoft on a USB flash drive that’s 8GB or larger.

Because snags are possible, back up all your important information on the Mac’s startup disk.

Basic training

Boot Camp Your Disk Could Not Be Partitioned Mojave

Following are the basic steps to get through Boot Camp:

Mojave Boot Camp Your Disk Could Not Be Partitioned

  1. Run Boot Camp Assistant (in the Utilities folder inside the Applications folder) to make sure that you have the latest firmware on your computer and to install any support software from Apple that you might need.

    You’ll find any updates at Apple support. If you’re using a portable computer, make sure to connect the power adapter. You will also be given the option to create a Windows 7 (or later version) install disk for which you’ll need a USB flash drive and an ISO image downloaded from Apple.

  2. Follow the prompts in Boot Camp Assistant to create a partition for Windows.

    You’re essentially carving out an area of your hard drive for the Windows operating system,. This partition must be at least 30GB and can swell to the total free disk space on hand minus 30GB. If you don’t plan on doing much in Windows, keep the partition small.

    Drag the divider to set the partitions for both OS X and Windows, or click Divide Equally to make equal partitions. You can’t resize a Windows partition after creating it, though you can replace it with a larger Windows partition.

    If you have a Mac Pro with more than one internal hard drive, you can select which drive to partition. If any of this makes you nervous, know that you can remove the Windows partition later and go back to a single-partition Mac.

    My answer will be applicable for MacBook Pro, iMac, Mac Mini etc. How to change boot camp partition size on mac

  3. Insert the Windows CD or a USB flash drive with the Windows ISO file and then click Start Installation.

    If you exited Boot Camp Assistant before installing Windows, open it again, choose Start the Windows Installer, and click Continue.

  4. When you’re asked to choose the Windows partition, select the partition that says BOOTCAMP.

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    You may have to scroll down to see it.

    Don’t erase any partitions that you see or create a new partition here. Failure to heed this warning could wipe out your entire Mac OS X startup disk.

  5. (Optional) If you see a listing for Drive Options, click it; otherwise, proceed to Step 6.

  6. Reformat the partition by using the Windows installer: Click Format.

    You’re using the reliable and secure NTFS file system, but you won’t be able to save files to Windows from Mac OS X, at least not without a techie workaround.

  7. Follow the onscreen instructions to finish installing Windows.

    Boot Camp 5.1 includes several Mac drivers so that Windows will recognize your trackpad, Thunderbolt, USB 3.0, the iSight (or FaceTime) camera, the Eject key on the Mac keyboard, networking, audio, graphics, and so on.

    A Boot Camp Control Panel for Windows and an Apple Boot Camp system-tray item will be added.

As with any new Windows computer, Microsoft requires that you activate your Windows software within 30 days.

Switching operating systems

You can go back and forth between OS X and Windows on your Mac, but you can’t run both operating systems simultaneously under Boot Camp. Instead, you have to boot one operating system or the other — thus, the name Boot Camp.

Restart your Mac, and hold down the Option key until icons for each operating system appear onscreen. Highlight Windows or Macintosh HD, and click the arrow to launch the operating system of choice for this session.

If you want OS X or Windows to boot every time, choose app → System Preferences, click Startup Disk, and choose the OS you want to launch by default.

You can perform the same function in Windows by clicking the Boot Camp system-tray icon and selecting the Boot Camp Control Panel. Click either the Macintosh HD or Windows icon, depending on your startup preference.