Windows 7 Forums
Welcome to Windows 7 Forums. Our forum is dedicated to helping you find support and solutions for any problems regarding your Windows 7 PC be it Dell, HP, Acer, Asus or a custom build. We also provide an extensive Windows 7 tutorial section that covers a wide range of tips and tricks.

Windows 7: Can't Access Unallocated Space On New Hard Drive

25 Apr 2014   #1

Windows 7 Enterprise x64
Can't Access Unallocated Space On New Hard Drive


I'm using Windows 7 and I've just purchased a new 3TB internal hard drive. I went to Computer Management to format the drive, but it will only allow me to access 2048GB. There is 746.52GB of unallocated space. When I right click on the larger part which I've formatted, "Extend Volume..." was greyed out. Please can someone tell me how to access all of the space on my new hard drive?


My System SpecsSystem Spec
25 Apr 2014   #2

Microsoft Community Contributor Award Recipient

Windows 7 Home Premium SP1, 64-bit

I think some motherboards can't handle 3 TB drives.

I haven't got a good handle on all of this myself, but you may have to use GPT partitions, rather than MBR.

You haven't filled out your system specifications, so no one knows what hardware you have.

I'd certainly dig into the motherboard's specifications at the manufacturer website and see what it supposedly supports.

Some motherboard manufacturers have something called a "3 Terabayte unlock tool" that supposedly helps in some cases. It's probably related to whatever chipset your motherboard has.

Do you intend to put Windows on this drive or is it just for data?
My System SpecsSystem Spec
25 Apr 2014   #3

Windows 7 Ultimate x64

Hi successgold,

I think this guide might be helpful for you on how to get it done.
Windows support for hard disks that are larger than 2 TB

Hope that helps you guided.
My System SpecsSystem Spec

26 Apr 2014   #4

Windows 7 Enterprise x64

Thanks for the help. I've got it working now.
My System SpecsSystem Spec

 Can't Access Unallocated Space On New Hard Drive

Thread Tools

Similar help and support threads
Thread Forum
How to handle the unallocated space on my external hard drive?
Hi, This is probably the silliest question ever, but I haven't done partitioning in a very long time and don't feel too confident, so here goes: I bought a 3 TB Seagate external hard drive a few years ago, created two partitions on it and left almost 1 TB unallocated. Can't remember why , and...
Hardware & Devices
Cannot merge unallocated hard drive space
So I got a new unused external hard drive, I was trying to partition it and ended up accidentally making half of it unallocated. I was trying to merge it back together but all the options like extend volume or make new simple volume are all greyed out. Anybody know what might be happening? Maybe...
Hardware & Devices
Cannot partition unallocated space on 4TB hard drive
I just bought a 4TB hard drive to replace my old one which was damaged. However it only allows me to partition 2TB and leaves the remaining 1.64TB as unallocated. I've tried easeus but it does not allow me to do anything with the unallocated space. I want to create 3 partitions with that...
Hardware & Devices
Hard drive 1MB & 101MB unallocated/unusable space
I have a 500GB hard drive that has 2 unusable bits of space. My obvious question is. Can it be fixed so they can be used or is this stuck like this? Picture:
General Discussion
unallocated hard drive space
I have a 5610Z Acer Aspire with Windows 7 (32 bit). I pulled a very boneheaded move getting to upgrade from Vista. I deleted my D:drive (50 G). I back up to a 500 G external hard drive. Is there a way to add the 59G to C:drive where I could use the space. Thanks Brightlight864:o
Installation & Setup

Our Sites

Site Links

About Us

Find Us

Windows 7 Forums is an independent web site and has not been authorized, sponsored, or otherwise approved by Microsoft Corporation. "Windows 7" and related materials are trademarks of Microsoft Corp.

Designer Media Ltd

All times are GMT -5. The time now is 04:33.
Twitter Facebook Google+