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Because of that, rEFInd will be loaded by the (U)EFI as a standard binary EFI executable (PE 32- or 64-bit, depending on the EFI), like any loader for an EFI operating system.
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Keep in mind that rEFInd itself is an EFI boot option. The OS will put its required boot code into the MBR and the partition boot sector(s).īut that is for CSM based booting to begin with. The logic: the CSM must act exactly as a BIOS would in order to be compatible. When the CSM is used, one option is to load the MBR boot code as a BIOS would.
#Refind boot manager boot problems how to#
You can work around this problem by using any number of tools (such as gdisk: Type x, then n, then w), but it can be frustrating and confusing if you don't understand the nature of the problem or how to fix it.Rod Smith Rod Smithġ7.9k 2 2 gold badges 22 22 silver badges 46 46 bronze badges When the Windows installer, booted in EFI mode, sees the hybrid MBR, it will complain that it can't install to an MBR disk. The catch to this type of installation is that Disk Utility and some other OS X tools will create a hybrid MBR if you try to prepare the disk for Windows - for instance, by setting up a FAT partition. An EFI-mode installation is likely to be safer because there's no need for the dangerous hybrid MBR that Macs use to dual-boot OS X and earlier versions of Windows. When installed in this way, no BIOS-mode boot code is necessary, in either the MBR or in the Windows partition(s). This brings up another point, though: Windows 8 (and presumably Windows 10) installs pretty well in EFI mode on many Macs. That said, boot code should exist in the MBR, although it might be destroyed by partitioning tools that assume the first 440 bytes of the MBR on a GPT disk should be zeroed out, as is normally the case for EFI-bootable GPT disks. Both rEFIt and rEFInd will place a copy of SYSLINUX MBR boot code in the MBR if the MBR is not already bootable and if appropriate boot code exists in a partition.