![]() Now we know it is the MBR partition style that makes you unable to create a new partition with unallocated space on the 3TB hard drive. How to partition 3TB hard drive to use its full size? Namely, on a 3TB MBR-based hard drive, only the first 2TB hard drive is usable, the rest 1TB disk space will be shown unallocated in Disk Management, which be the main reason why many users find their 3TB hard drive only shows 2TB. This partition style only supports up to 2TB hard drive. If you check the partition style, you will find it is MBR. ![]() So, why you cannot create a new partition with the unallocated space on 3TB disk? That’s something wrong with the partition style the disk uses. ![]() Why you can't create a new volume with unallocated space on 3TB hard drive? But, when I right click it, I found the “New Simple Volume” option is grayed out. So why and how can I partition this 3TB hard drive? I used Windows Disk Management to create two 1TB partitions, and I was trying to create a third partition with the left unallocated space. However, I forgot to partition hard drive at the beginning of the Windows installation. “I have a Seagate 3TB hard drive, and I install Windows 10 on it. Can't partition unallocated space on 3TB hard drive
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