Adam, you've misread my comment about Windows and MBR. Allow me to rephrase: When booted in BIOS mode, Windows will only install to or boot from an MBR partition table (normally without a GPT, although Windows treats hybrid MBR disks as MBR disks); and when booted in EFI mode, Windows will only install to or boot from a GPT disk (WITHOUT any MBR entries except for the type-0xEE protective entry). Thus, if a disk has an MBR with non-0xEE partitions defined, as Allen reported, and if it's successfully booting Windows, then it follows logically that Windows is booting in BIOS mode on that computer, not in EFI mode, since Windows will not boot in EFI mode from an MBR disk (AFAIK).
You are correct that the GPT spec requires a protective MBR; however, when I refer to an "MBR partition table," I mean a real MBR partition table with actual defined partitions, NOT merely a protective MBR, which is just a dummy data structure intended to keep GPT-unaware utilities and OSes from messing with the disk. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/811485 Title: EFI SYSTEM PARTITION should be atleast 100 MiB size and formatted as FAT32, not FAT16 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/partman-efi/+bug/811485/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
