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Windows 7: UEFI Booting of GPT partition doesn't work after 2nd HDD was added

10 Nov 2011   #1

Windows 7 Professional 64bit
UEFI Booting of GPT partition doesn't work after 2nd HDD was added

Good day,

I have an Asus Z68 mainboard with UEFI-BIOS. Windows 7 Professional 64bit is installed in UEFI mode on a GPT partitioned drive (SSD). It worked flawlessly.

Now I added my second, old harddrive, that is still MBR formatted.
Windows won't start anymore, instead I am seeing "Windows is loading files", then a blinking cursor, and that's all.

I have two options in BIOS regarding boot priority:
1) I can boot from the SSD as primary priority
2) I can select an option called "Windows Boot loader", I think this refers to the UEFI boot code that Windows wrote to the UEFI.

If I select the first option, I get the "Windows is loading files screen" and then the "Windows has detected a startup error, do you want to repair the system startup" screen. If I select "Start Windows normally", I get a blinking cursor and then nothing. If I select "Repair startup", I see "Windows is loading files", and then again the "Startup repair screen". It is an endless loop.

If I select the second option, I get "Windows is loading files", then a blinking cursor, and nothing more.

Is there any way to get my Windows to boot again without disconnecting or re-partitioning the old harddrive?

Note that the old harddrive is NOT for booting, as it is just a datastore.


My System SpecsSystem Spec

10 Nov 2011   #2

Windows Home Premium x64


Have you checked that the BIOS is not trying to RAID your 2 devices, your should find that in Integrated Peripherals (or something similar) in the BIOS
My System SpecsSystem Spec
11 Nov 2011   #3

Microsoft Community Contributor Award Recipient


Make sure the Hd Drive is showing in BIOS, also the boot order of the drives.
My System SpecsSystem Spec


 UEFI Booting of GPT partition doesn't work after 2nd HDD was added

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