The EFI partition did not contain the boot loader for Mac OS X. After the EFI partition was a HFS+ partition that contained Mac OS X. The specification for EFI requires an EFI partition at the start of the disk, and Apple-partitioned disks had a 200 MB empty EFI partition. Earlier builds of the original version of Mac OS X could boot on FDisk partitioned disks, but past those earlier builds, GPT was the partition scheme that all Intel-based Macs started with. Intel-based Macs are different from PPC-based Macs, as they used EFI to boot the operating system. When Mac OS X was introduced, the partition scheme was the GUID Partition Table, or GPT. I’ll then discuss how this affects High Sierra and finally some guesses on where this is all leading.

How does this affect Boot Camp? Let’s dive in a bit and look at the progression of partitioning changes since Boot Camp was introduced.

APFS is not just a filesystem to replace HFS+, but also replaces Core Storage as the volume manager. If you have multiple internal hard drives, you can select a different hard drive from the one running macOS and create a single partition on that drive to use solely for Windows.MacOS 10.13 High Sierra has now been released, and one of the major features is a new filesystem called APFS. This process may take a long time to complete (you can click the Stop button to interrupt this process).Īt the Create a Partition for Windows step, specify a partition size by dragging the divider between the macOS and Windows partitions.

The Windows files are copied to the USB drive. This process may take a long time to complete (you can click the Stop button to skip this process).Īt the Select Tasks step, select all the tasks, then click Continue.Īt the Create Bootable USB Drive for Windows Installation step, choose the Windows ISO image and the USB drive, then click Continue. Older Time Machine snapshots and cached iCloud files are removed to make space for Boot Camp. The system is checked for total available disk space. On your Mac, open Boot Camp Assistant, located in /Applications/Utilities.Īt the introduction screen, click Continue. Important: If you’re using a Mac notebook computer, connect it to a power source before continuing.Ĭonnect an external USB drive or insert a flash drive into the USB port on your Mac keep it connected or inserted while you install Windows and the Windows support software.

Boot camp mac os high sierra