
Let's start with an example saying can't turn second unallocated partition into a simple volume: I just bought a 3TB external hard drive. Case 1: New Simple Volume Greyed out on 3TB Hard Drive Next, we will show you the detailed information. What causes New Simple Volume Greyed out? Usually, this situation will appear if you are creating volume on a 3TB hard drive or on a removable disk. However, in some cases, this feature is greyed out as shown in the picture below, making us unable to create partition on unallocated space Windows 7/8/10.

In Disk Management, we can select an unallocated space and then make use of the New Simple Volume feature to create new partitions.

New Simple Volume Greyed out on Removable Disk

Case 1: New Simple Volume Greyed out on 3TB Hard Drive.
