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After doing a clean install of Windows 8 my Seagate 3 TB HDD won't reactivate in Disk Management. The two volumes are there but I can't use them for some reason. The drive was previously used with a GPT partition table, I can see the two spanned volumes but can't reactivate either.

I backed up all my files from Windows 7 onto that drive and desperately need them back. What can and should I do to get the drive back up and running?

When I go to Disk → Properties → Volumes, it claims the drive has a MBR partition style, so converting to GPT somehow without data loss should work. gDisk claims to be able to do that but when I point it to the drive, it claims that it has a GPT partition and a protected MBR partition.

Any suggestions on what to do?

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the protected MBR partition is part of the standard GPT partitioning method I think. Its meant for systems that don't do GPT. I'm not sure why, but I think mentioning if its 32 or 64 bit windows 8 might help. Some windows versions won't install on GPT if its 32 bit. –  Journeyman Geek Oct 15 '12 at 2:09
    
oh, Windows 8 64bit Pro. –  isif Oct 15 '12 at 2:15

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