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I have Ubuntu 12.04 LTS 64bit installed on one hard drive and Windows 7 installed on another hard drive. I can boot into each find when only one hard drive is plugged in. With both plugged in and in Ubuntu, running update-grub does not find the Windows 7 installation. With Both hard drives plugged in I cannot boot windows. The motherboard is an MSI 990XA-GD55.

I had installed Ubuntu first. Unplugged the Ubuntu drive to install windows to avoid overwriting the MBR (assuming windows still does that these days).


I think that windows only boots when the EFI boot option is selected in the BIOS, whereas usually the hard drive is specified. Have I somehow managed to install one as EFI and one as MBR? If so what does that actually mean, is this why grub cannot see the Windows installation? I would ideally have Windows as an option in the grub menu. Is this possible?

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iam not sure but try to install boot Repair and choose advanced option

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Thanks for your answer, would doing this (with the Ubuntu drive plugged in) possibly wipe out grub? – Mark Aroni Jan 22 '14 at 19:41
it will repair the grub – user234517 Jan 23 '14 at 2:57

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