FileVault encrypts your drive on-the-fly. Boot Camp cannot securely split an encrypted volume.
Steps:
Note: You can re-enable FileVault after Windows is installed, but it may affect boot speed. bootcamp 40 4033 windows 10 install
Run Boot Camp Assistant. It will ask you to split your drive. For Windows 10, allocate at least 60GB. Drag the slider. Click Install.
The assistant will:
You’ve cleared 50 GB of space on your Mac. You’ve downloaded the pristine Windows 10 ISO from Microsoft. You’ve opened Boot Camp Assistant with confidence. Then, halfway through creating the USB installer or partitioning the drive, disaster strikes: The Boot Camp installer fails with the cryptic message: "An error occurred while partitioning the disk. Please run First Aid from Disk Utility. (Error 40 4033)."
For thousands of Mac users, the bootcamp 40 4033 windows 10 install error is a frustrating roadblock. This error is not a hardware failure, but a software configuration conflict. The good news? It is fixable. FileVault encrypts your drive on-the-fly
In this 3,000+ word guide, we will dissect exactly what error 40 4033 means, why it happens, and provide seven proven methods to bypass it—so you can finally get Windows 10 running natively on your Mac.