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Windows 7 64-bit: setup was unable to create a new system partition gpt disk

Posted on 2014-07-23
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Last Modified: 2014-07-23
I have an Adaptec 6405 RAID controller with an 11TB RAID array.  I am trying to install Windows 7 Pro 64-bit on the array.  I have booted from the Windows DVD in EUFI mode but when I select the partition windows gives me the message: "setup was unable to create a new system partition or location an existing system partition.  See the setup log files for more information"

I created the partition using the following commands:
diskpart
list disk
select disk <id>
online disk
attributes disk clear readonly
clean
convert gpt
create partition efi size=102
create partition msr size=32
create partition primary
format fs=ntfs label="Operating System"
assign letter=C
exit

What am I doing wrong.  How do I install Windows 7 on this drive (RAID array)?
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Question by:David Barman
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Expert Comment

by:Mitchell Milligan
ID: 40214433
This could be because you do not have the driver loaded for the RAID controller.  Try importing that driver into the Windows 7 installation when you get to the disk selection screen.  Then, after importing your driver, run your commands as listed above, but stop at the convert GPT, this will give you a blank GPT disk that windows 7 should see.  Then go back and use the standard GUI Windows 7 installation wizard.  That should detect that the disk is running in GPT and create all those partitions on its own.
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Author Comment

by:David Barman
ID: 40214492
The problems is not that I cannot see the drive.  I can load the driver and see the drive.  It just won't install windows on the partition that I created using the diskpart command I listed above.
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Mitchell Milligan earned 2000 total points
ID: 40214505
Then after you load the drivers, try like I said.  Run those commands up to the Convert GPT part, then go back and use the Windows install wizard to do the rest.  Have you tried that?  That is how I got Windows 8 to install as GPT, and according to what my bench tech says, that should do the trick for windows 7 as well.

For Diskpart, use these commands:
Diskpart
list disk
sel disk <id>
clean
convert gpt

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Author Comment

by:David Barman
ID: 40214542
Ok.  Did that.  It got farther.  Now during the windows installation the following messages pops up:  "Windows could not prepare the computer to boot into the next phase of the installation.  To install windows, restart the installation"

What is this about?
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Expert Comment

by:Mitchell Milligan
ID: 40214672
Check your BIOS to see if the RAID array is set as the first boot device, and that your BIOS boots as a UEFI device, not a legacy device.  That is typically the issue here.
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Author Comment

by:David Barman
ID: 40215256
Ok.  I got it to work.  After running through diskpart commands for a second time and deleting all of the partitions are re-initializing the disk as GPT then windows was able to create the partition and then install Windows.  10.9TB partition!
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Author Closing Comment

by:David Barman
ID: 40215259
This fixed the problem after I started from scratch and initialized the disk, and converted it to GPT, then let Windows setup do the rest.
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Expert Comment

by:Mitchell Milligan
ID: 40215419
Excellent! Glad it worked.  That is amazing isn't it? A 10.9 TB partition?!?!? What is your raid configuration for my curiosity? How many disks? What size disks? What raid style?
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Author Comment

by:David Barman
ID: 40215433
It's just a RAID-5 with (4) 4TB SATA drives
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Expert Comment

by:Mitchell Milligan
ID: 40215473
Wow, that's awesome!  That kind of storage is unreal!

A side note: look into raid 10 at some point.  It is much better than raid 5 at this point, and much more fault tolerant.  Raid 10 with those disks would be 2 x 4tb discs striped, then those two discs mirrored to two more 2 x 4tb discs striped the same.  You get quality performance with stronger fault tolerance.  You can loose 2 drives and still be up and running, and your effective storage space would be 8tb, which is still significant.  With Raid 5, if you loose 2 drives, you are toast.
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