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Jan 06, 2019  Installing Windows 10 using the Boot Camp Assistant app, but each time the app gets to the partitioning step it errors out saying “Your disk could not be partitioned”, suggesting “run Disk Utility to check and fix the error”. Apr 03, 2019  Boot Camp Error Solved “The Startup Disk Cannot Be Partitioned Or Restored To A Single Partition” BootCamp is the utility in your Mac that would let you have your own Windows installed in it. The program helps you switch between the MacOs.

• Mac Boot Camp Disk Cannot Be Partitioned One
• Windows 10 Boot Disk Partition

In certain circumstances, Boot Camp Assistant might stop responding, or it might say that Boot Camp installation failed while copying the Windows installation files. Follow these steps to resolve the issue:

1. If you're in Boot Camp Assistant and it isn't responding, use Option-Command-Escape (Esc) to force the app to quit.
2. Install the latest macOS updates, which can include updates to Boot Camp.
3. Download the latest edition of Windows 10 from Microsoft's website. Then use Boot Camp Assistant to install it.

Mac Boot Camp Disk Cannot Be Partitioned One

If Boot Camp Assistant says that the startup disk cannot be partitioned or restored to a single partition, complete these additional steps:

Windows 10 Boot Disk Partition

1. Open Disk Utility, which is in the Utilities folder of your Applications folder.
2. Select your Mac startup disk (Macintosh HD) in the sidebar.
3. In the Disk Utility toolbar, click Partition.
4. If Disk Utility asks whether you would like to add a volume to the container or partition the device, click Partition.
5. Click OSXRESERVED in the graph that appears, then click the remove button (–) below the graph.
   
6. Click BOOTCAMP in the graph, then click the remove button (–).
   OSXRESERVED and BOOTCAMP are empty partitions that Boot Camp Assistant created during the failed installation.
7. Click Apply, then click Partition to confirm.
   
8. Open Boot Camp Assistant and try installing Windows again.