Boot Partition over 2.2TB Limit

I have a computer with a RAID array composed of many hard-drives equaling 4.8TB. My motherboard is an Asus Maxiumus IV Extreme with EFI and I'm using the onboard RAID. I'm trying to install Windows 7 x64 SP1 Professional to the RAID array to use it as my primary boot partition. From what I read is this possible due to the fact I have EFI on my motherboard, Windows 7 x64 Professional and the latest drivers.

Windows refuses to install on the hard drive, what can I do to remedy this? Please advise.
pcdepotdirectAsked:
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McKnifeConnect With a Mentor Commented:
Sorry about MS, they did not try their howto, I think.
Use the command "convert gpt" after select disk x.
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Thomas GrassiSystems AdministratorCommented:
I would get a SSD drive and install the OS on that use your raid for important data.
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David Johnson, CD, MVPOwnerCommented:
you have to initialize the drive as a gpt partition not a mbr partition. Your windows disk has 2 boot partitions and you should use the efi boot partition.
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pcdepotdirectAuthor Commented:
trgrassijr55:
This client already has these drives and is looking for a combination of space and speed. He doesn't have any important files and wipes Windows frequently. This is a gaming computer.

ve30fa:
How would I initialize the disk as GPT?
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David Johnson, CD, MVPOwnerCommented:
boot from the EFI windows 7 boot loader, you will have set this explictly in your boot options or on my machines f8 brings up the choose boot disk option.

at the very first screen hold down the shift key and press f10 this will bring you to  a command prompt
diskpart
list disk
sel disk xx where XX represents the # from list disk
clean
exit

Continue on with installation.
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pcdepotdirectAuthor Commented:
I'm having an issue explicitly having it boot to the DVD using EFI. I don't know whether it does this by default and I can't seem to find any setting to make it do it.
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Thomas GrassiSystems AdministratorCommented:
When you power cycle the computer hit the key that says boot options.

Does your cd\dvd drive show in the list? if so select it and boot the dvd.

Thats the windows 7 dvd installation right?
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pcdepotdirectAuthor Commented:
I can boot to DVD no problem. But when you say boot to DVD using UEFI I'm not certain I'm doing that.
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Thomas GrassiSystems AdministratorCommented:
Ok if you can boot from the dvd then do so.

when the windows screen appears showing you language  click next

then click repair your computer

then select command prompt

next follow the instructions that ve30fa showed above
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McKnifeConnect With a Mentor Commented:
...but do some more with diskpart. So far, the steps don't change the volume type to GPT.
See http://support.microsoft.com/kb/297800
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pcdepotdirectAuthor Commented:
When following:
http://support.microsoft.com/kb/297800

I get to step 4 where I type in "new GPT" and it says thats not a valid command. Grrr.
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pcdepotdirectConnect With a Mentor Author Commented:
I figured it out. My motherboard has 2 SATA controllers. One SATA Controller with RAID with 4 x 3GBs and 2 x 6GBs and another SATA controller with 2 x 6GBs.

I set the 6 Hard Drives up on one controller using RAID 0 for a total of 5.5TB. I had to use an external DVD drive to be able to using UEFI when booting into the Windows disk. For whatever reason the DVD drive won't only boot into UEFI if it was plugged into the same SATA controller with the Hard Drives. If it was plugged into the other SATA controller it would not have "UEFI" infront of the boot string.

Once in the Windows installer I loaded RAID drivers and simply selected the 5.5TB drive and it installed to it with no issue.

Thank you for all your help.
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David Johnson, CD, MVPOwnerCommented:
I told you you had to use the EFI boot and it would work fine.
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pcdepotdirectAuthor Commented:
Depending on your particular configuration some options will change.
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