Mac Boot Camp Disk Cannot Be Partitioned

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  1. Remove Boot Camp Partition
  2. Mac Boot Camp Disk Cannot Be Partitioned Safe
  3. Mac Boot Camp Disk Cannot Be Partitioned Free

By default, your Mac starts up from its built-in hard disk, but a startup disk can be any storage device that contains an operating system compatible with your Mac. For example, if you install macOS on an internal or external drive, your Mac can recognize that drive as a startup disk. You can then follow the steps in this article to start up from it.

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Use Startup Disk preferences

When you use Startup Disk preferences to select a startup disk, your Mac starts up from that disk until you choose a different one.

Don't Be Put Off By this Big Wall of Text if you know anything about Boot Camp and Disk Utility Please Help. Ok this story starts a while back, I want to get Windows Vista Business on my MacBook so I tried to partition my disk it didn't work I read the Boot Camp guide and Backed Up and Erased. On the 2012 MacBook Pro, BCA is able to successfully create the Windows 10 USB-drive installer and create the hard disk partition. Upon restarting, three options are shown: Macintosh HD, Windows, and Windows EFI. The Windows option leads to a blank screen that says 'No bootable disk found. Please insert bootable disk and press any key'.

  1. Choose Apple menu  > System Preferences, then click Startup Disk.
  2. Click the lock and enter your administrator password.
  3. Select your startup disk, then restart your Mac.

If you see a message that your security settings do not allow this Mac to use an external startup disk, check the External Boot setting in Startup Security Utility.

Use Startup Manager

When you use Startup Manager to select a startup disk, your Mac starts up from that disk once, then returns to using the disk selected in Startup Disk preferences.

  1. Press and hold the Option (Alt) key immediately after turning on or restarting your Mac.
  2. Release the Option key when you see the Startup Manager window.
    If your Mac is protected by a firmware password, you can release the key when you're asked to enter the password.
  3. Select your startup disk, then click the arrow under its icon, or press Return.
    If you press and hold the Control key during this step, your selection is saved in Startup Disk preferences, so it persists until you change it.

If your Mac is using OS X Lion 10.7.3 or later, you can also use this method to start up from your Time Machine backup disk. Startup Manager identifies your Time Machine backup as ”EFI Boot.”

If you can't select your startup disk or start up from it

Check for these possibilities if you can't see your disk in Startup Disk preferences or Startup Manager, or your Mac won't start up from it.

Check for a compatible operating system on the startup disk

Time

Make sure that your startup disk is using a version of macOS that is compatible with your Mac.

To start up from an external disk with macOS Catalina 10.15 or later, the disk must connect via USB-A, USB-C, or Thunderbolt, not FireWire.

Check startup security settings

If you're using a Mac that has the Apple T2 Security Chip, check the settings in Startup Security Utility. These settings determine whether your Mac can start up from another disk.

Remove Boot Camp Partition

Check for Option ROM firmware

Mac Boot Camp Disk Cannot Be Partitioned Safe

If you're in Startup Manager and can't see a third-party startup disk, the startup disk could be using Option ROM firmware. To enhance system security, Mac computers with up-to-date software don’t show devices that use Option ROM firmware until you load their firmware. To do that, press Option-Shift-Command-Period while in Startup Manager. If your startup disk appears, do that each time you want to start up from it or from another disk connected to it.

Mac Boot Camp Disk Cannot Be Partitioned Free

If you're using a firmware password, the ability to load Option ROM firmware is disabled as an additional security protection.