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Windows 7: using all of raid5 disk space W7x64Pro

15 Mar 2011   #11

Windows 7 Ultimate x64

Sorry J_K, I tried both home and demo_pro but both state "This disk uses MBR format, the disk space beyond 2 TB will be unusable." and that is all I can do I wish these programmes allowed copy and paste for their error messages

If there is programme to try that will be great, I am struggling to find anything and am surprised that my mobo doesn't have the software to do it.

My System SpecsSystem Spec
15 Mar 2011   #12

Windows 10 Pro x64

You need to use GPT partitions if you want to have partitions larger than 2TB, or a volume that can contain partitions farther out than the 2TB boundary. The MBR partition type has a maximum size of 2TB (which you've created), and on this system it would have been better to create a smaller volume in the RAID utility for the OS and application partition (150-200GB would have worked quite well) with another volume spanning the rest of the space to hold a GPT partition. You cannot mix MBR and GPT partitions on the same volume, hence you cannot use the space above the 2TB limit on that volume - MBR cannot address it, so Windows won't let you do anything with it and thus greys out the menu options in disk management. You need to create 2 volumes in your RAID array - let setup use the smaller one (as an MBR partition type volume), and then use diskmgmt.msc to create a GPT partition type volume on the second (larger) RAID volume. This is the only way you'll be able to use that space, period. It's a BIOS and MBR design/hardware limitation that no software is going to be able to get around, hence there's no software that can do it .

Also note that Windows 7 doesn't create a GPT partition as the boot or OS partition nor can it boot from one either on a BIOS-based PC (hence why setup created that partition as an MBR partition), although an UEFI-based machine could do it (you just have to use diskpart during setup to create the GPT partitions manually, amongst other things).
My System SpecsSystem Spec
17 Mar 2011   #13

Windows 7 Ultimate x64

Thank you cluberti, I thought that the 2TB limit was per partition and that I would be able to have the raid volume as:

100MB System Reserved2047.90GB C: Partition746.54GB D: Partition

I managed to screw it all up though (before reading your comments) when I tried to partition the unallocated space; I selected the unallocated space and format, the option of the same size came up and I thought 'great' but when it was done, the partition had been done in the middle of the 2049GB partition - 'Oh Bugger' I thought , worse to come though, I couldn't even get it to boot

I am so glad I screwed up in RAID 5 though, none of my spare disks would work (I think my one spare SATA disk is knackered and I can't get my mobo to recognise any IDE disks?) so I ended up taking a disk out the raid, formatting that to put win7 on and then getting the data back from the others, worked a treat - to look at windows folder tree on the raid volume I would never tell a disk was missing . I did use Easeus Partition Master to take the new partition out (not sure if that was necessary) and then I used it to assign a letter to the 2047.90GB partition.

I now have all my documents backed up again, including the ones from the last few days that weren't backed up (although backed up two days before, one was my fiancee's dissertation which had about six hours extra work on it and another was her course work with about four hours work on )

Thank you all for help and advice, I am going to ask about how to set my drives up but will do so in a new thread so not to change the topic of this one.
My System SpecsSystem Spec


 using all of raid5 disk space W7x64Pro

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