![]() The drivers will load correctly (except for IntelMEI, which can be removed from the drivers folder). However, the process we outlined for booting to an external USB flash drive did not load the AppleSSD driver due to the lack of the AutoUnattend.xml injecting the AppleSSD driver to the USB flash drive would require another Windows machine.Ī better solution is to add in an AutoUnattend.xml back in: Always $WinPEDriver$ The process we recommend is to boot from a USB flash drive and inject the driver. The Apple T2 co-processor manages the internal SSD in the new Macs, so in order to migrate Windows from an older Mac to one of the new T2 Macs, the AppleSSD driver needs to be injected into the restored Windows. I discovered this change when updating the Resolving INACCESSIBLE_BOOT_DEVICE Error after restoring Winclone image article for the new Macs. Windows needs these drivers for the SSD for initial boot. I suspect that Apple moved to injecting the drivers to the boot.wim so that the drivers are available earlier in the boot process. A Windows WIM file has the file signature of MSWIM: Opening it with HexFiend shows a new signature for the file: APWIM. In fact, in the BootCamp\Drivers\Apple folder, there is a new file called BCWim.bin. This requires Boot Camp Assistant to understand the internals of WIM in order to inject the driver (which is normally done by the Microsoft DISM tool). The WindowsSupport no longer contains the AutoUnattend.xml file to point to the drivers, instead injecting the drivers directly into boot.wim file. The new T2 Macs modify this process in a pretty significant way. There are some other things that Boot Camp assistant does, but those are the important parts. The next time the Mac boots into macOS, the installer partition is removed.Windows is installed from the install partition to the Boot Camp partition. The Mac is then restarted to the installer partition. ![]() ![]() BootCamp: The Boot Camp drivers, apps, and installer.AutoUnattend.xml: A configuration file to define where the $WinPEDriver$ folder is, what options are shown to the user, registry changes, and some post-install scripts.These are copied to Windows after install is complete. $WinPEDriver$: All the drivers required for booting to the installer and for installing Windows.Boot Camp Assistant downloads and copies the Windows Support software to the new installer partition.Boot Camp Assistant copies all the files from the Windows 10 ISO to the new installer partition.Boot Camp Assistant creates two FAT32 partitions from space on the Mac volume (APFS or HFS ): one partition for the installer files and one partition for the Boot Camp partition.While investigating support for Winclone for the amazing new T2 Macs (including the new 2018 MacBook Air and 2018 Mac Mini), I discovered that the way Boot Camp Assistant installs Windows has changed a bit. ![]()
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