Launch Disk Utility and check if the drive is no longer available just to confirm that the Boot Camp partition has been removed.

Click “Quit” once the process is complete.

Depending on the size of the drive this may take a few minutes. If your computer has multiple internal disks, select the Boot Camp disk with Windows installed on it and hit “Restore disk to a single macOS partition”, followed by “Continue”.If your Mac has a single internal disk, then you'll see a “Restore Disk to a Single Volume” window click “Restore”.If you’re prompted to select a task, click on either “Remove Windows 7 or later version” or “Remove Windows 10 or later version”, whichever is relevant.Open up Launchpad, click Utilities, and then Boot Camp Assistant.Quit all open apps and log out of any other users that are currently logged in.Back up all the data that you need from the partition.Regardless of how much disk space you have allocated to Windows, it is nothing more than a waste of storage if your startup disk is getting full, and so in these situations it is recommended that users either wipe away the macOS partition using Mac optimization software such as CleanMyMac, OnyX, and the like, or remove the Boot Camp partition to reclaim gigabytes of disk space. This newly created partition will be named Boot Camp by default. This space will be taken up on the built-in hard drive (which may have limited storage space), allocated to the Windows OS during the installation process. If you are installing Windows for the first time, you will require at least 30GB of free space, increasing to 40GB if you are upgrading from a previous version of Windows. As with every operating system, Windows requires its own partition and its own file systems, which means to use it on a Mac requires you to repartition the drive using Boot Camp assistant in order to install the Windows operating system. Software incompatibility may force some Mac users to take the ultimate step and install Windows on their computer using Boot Camp. Are you receiving that uncomfortable notification from macOS informing you that “ your disk is almost full“? You can save space by optimizing storage using iCloud Drive – if you rent enough space from Apple – or reclaim space by removing the Boot Camp partition that was required when you installed the Windows operating system.

Partition size for windows 10 on mac