![]() Apple leveraged the guard MBR in the GPT specification and created a hybrid MBR. A legacy disk manager can read the guard MBR as a standard MBR but would only show an unknown type for the entire disk. The guard MBR is a single partition MBR that lists the single partition as a type of “Unknown” and covers the entire disk. The guard MBR is part of the GPT specification that prevents legacy disk utilities as seeing GPT disks as unformatted. ![]() Since Windows XP was expecting an MBR partitioned disk when booting, a Boot Camp partition needed to exist on a GPT partitioned disk, but also look like a MBR partitioned disk.īoot Camp booting solved this problem by modifying the guard (or protective) MBR to look like a standard MBR. EFI can be compatible with legacy booting, but on Windows PCs, the firmware is set to tell EFI to boot in Legacy mode to an MBR disk. Windows had a very different way of booting, based on a Master Boot Record (MBR), sometimes refered to this as “Legacy Booting”. ![]() When Boot Camp was introduced to the Mac, Windows XP was all the rage. The boot loader was located on the HFS+ volume in /System/Library/CoreServices. 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. “Here’s what you can do to try to fix your problems with getting Boot Camp to work on macOS High Sierra.MacOS 10.13 High Sierra has now been released, and one of the major features is a new filesystem called APFS. “The other problem that you might run into is some kind of file system corruption,” Keller writes. These backups are created quickly once every hour, and while activities like downloading files or installing apps shouldn’t be affected by their presence, for some reason, Boot Camp is.” “First, you’ve got local snapshots, backups of your Mac stored locally, rather than on your Time Machine disk. “There are a couple of reasons that this could be happening,” Keller writes. “For instance, perhaps you get an error telling you that your disk doesn’t have enough space, even though macOS has shown you that, indeed, there is enough.” However, many macOS High Sierra users have reported trouble creating new Boot Camp partitions on the latest version of Apple’s operating system,” Joseph Keller writes for iMore. “Boot Camp is the macOS solution for installing an alternative operating system on your Mac, letting the new OS run natively on your Mac rather than in a virtual machine.
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