What does “Unallocated”mean on a hard drive?
Any physical space on a hard drive that does not belong to a partition will be
displayed as “Unallocated” in Disk Management. This means that the space does not
exist to the operating system and you cannot write data onto it. Moreover, you will
not be able to see it in Windows File Explorer, which is one of the most important
causes for hard
drive not showing full capacity.
Need to remove unallocated space on hard drive
As described above, the unallocated space cannot be used as other normal partitions
to store data. And the space isn’t automatically allocated to other existing
partitions on the disk. In order to recover the extra space and make fullest use of
the hard drive, it is necessary to delete unallocated partition.
How to delete unallocated space in Windows?
To delete unallocated partition on hard drive, you can either create a new partition
using this space or merge it to an existing partition. To accomplish those jobs, you
can use Disk Management or professional disk manager software.
Option 1. Use Disk Management
First of all, you need to open
Disk Management: Right click “My Computer/This PC”, click “Manage>Storage>Disk
Management”. Or use “Windows+R” to open Run, type “diskmgmt.msc” in the empty box
and tap “OK”.
> To create a new partition on this unallocated space:
right click the unallocated space, and select “New Simple Volume”, then New Simple
Volume Wizard will pop out, follow it to create a new partition.
> To extend an existing partition with unallocated
space: right click the left volume that is next to the unallocated space,
select “Extend Volume”. Then Extend Volume Wizard will appear, just follow its
prompts, you can merge the unallocated space to the existing partition successfully.
In those two methods, the unallocated space will disappear and you will get a new
partition or enlarge another partition. However, Disk Management cannot delete unallocated space via the above methods in the following situations.
1. When you try to repartition removable storage devices or create a new
partition on 3TB MBR Hard Drive, the New Simple Volume will be greyed out,
because Windows won’t let you repartition removable storage devices, MBR disk only supports 2 TB hard disk at most, and you can only create up to 4 primary partitions on MBR disk.
2. When the unallocated space is not behind
the volume you want to extend, Extend Volume greyed out as well in Disk Management.
Both cases will prevent you from making any changes to the
unallocated space. At that moment, you can turn to AOMEI Partition Assistant
Standard. Read on for more information.
Option 2. Apply AOMEI Partition Assistant (Easy, Powerful, Versatile)
AOMEI Partition Assistant Standard is a free, but quite powerful disk management tool. When the Disk
Management fails, it is a great alternative. It allows you to convert MBR to GPT without
data loss, then you can create more partitions on a GPT disk, meanwhile, you can use it to repartition removable storage devices. Moreover, it can merge
unallocated space to an existing partition easily even when they are not adjacent.
All in all, you can delete unallocated space by creating a new partition or merging
it to an existing partition via this software. Besides, you can also use it to delete hidden
partition. Now you can download the
freeware and try to remove the unallocated partition on a hard drive.
To create new partition on unallocated space:
Step 1. Install and launch AOMEI Partition Assistant, right click the unallocated
space and select “Create Partition”.
Step 2. In this window, you can specify the size and location of the being created
Step 3. Back to the main interface, click “Apply” to commit the pending
To merge unallocated space to another partition:
Step 1. In the main interface of AOMEI Partition Assistant, right click the
unallocated partition and go for “Merge Partition”.
Step 2. In the window, the unallocated space is automatically chosen, you just need
totick another existing partition and click “OK”.
Step 3. Click “Apply” to start merging the unallocated space to the target
The methods above can help you to delete unallocated partition in Windows 10/8/7.
Apart from deleting partitions, AOMEI Partition Assistant can also help copy/move
For more advanced features such as partition alignment,
allocating free space from one partition to another, converting
boot disk between MBR and GPT styles and more, you can upgrade to AOMEI
Partition Assistant Professional.