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So I have just used gdisk to remove the MBR on my Mac's drive because I got annoyed that I couldn't access my fifth partition - but then learned I could with GPT. Now that I did the "conversion" (its rather just like erasing the MBR and overriding it with a protective MBR) I am facing this one issue that just smells like it's trying to boot with BIOS/MBR although it isn't supposed to:

Couldn't find bootable drive - please insert drive.

Aka. it can't find it's partitio since the MBR is gone.

I don't have my windows install around, so I would like to know if I am able to change Window's boot mechanism from Mac OS? It's Windows 8 that's making the issue.

Ingwie Phoenix
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1 Answers1

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Windows will boot from a GPT disk ONLY if its a 64 bit edition and it's running on UEFI.

Most (older)Macs run EFI 1.1, which is not the same as UEFI, which Windows can boot on.

Newer macs, from about 2011 I think, use UEFI (EFI 2.0) and therefore run Windows x64 in UEFI mode just fine.

Milind R
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