Why move unallocated disk space to C drive?
Unallocated disk space refers to the unused hard drive space on your disk. It won’t
show up in Windows Explorer, yet you can check if you have unallocated space in Disk
Management by typing diskmgmt.msc in Run box. Moving unallocated space to C drive in
Windows 10, 8, 7 is good way to enlarge system drive, so that you can install more
programs there and keep other programs function well. The performance of your system
drive will directly affect the function of your running operating system and
software, games in particular. More free space makes creating personal files
Some computers are come with small-sized system drive when produced by manufacturers.
If there is plenty of free space in other partitions like D, E, you can allocate free space from each
partition to C drive directly. All in all, you may hold other factors that force you
to extend the system drive. The most important thing is to find how to move
unallocated space to C drive using the simplest method.
How to allocate unallocated disk space to C drive in Windows 10/8/7?
The method you choose to add unallocated space to C drive is determined by the
location of unallocated disk space. Generally speaking, you have three ways to
complete this task, built-in Disk Management, Diskpart and third-party software.
Add unallocated space to C drive in Disk Management
As covered before, the location of the unallocated space affects your choice. If it
is next C drive and at the right side of C drive, you can add it to system drive
i.e. C drive directly in Disk Management. Open Disk Management by following
aforementioned approach. Right click C drive and select “Extend Volume” in the menu.
The only thing left to do is following the wizard to resize system partition.
Transfer unallocated space to C drive via Diskpart
Likewise, you can directly extend C drive to the unallocated space when the space is
adjacent to C drive. Let’s get to know how to work this out using CMD.
1. Press Windows key plus R key to open Run. Type diskpart and press Enter. Run as
2. Type following commands in turn and each command has an Enter followed by.
That is a simple method of combining unallocated space to C drive as well. However,
what if the unallocated space is separately distributed on the hard drive, for
example, the unallocated space after D drive in the screenshot? If you right click C
drive this time, only to find the “Extend Volume” grayed out. And you’ll get Diskpart
failed to extend the volume error in Diskpart. Otherwise, you need to delete
the in-between partition, extend C drive and then restore the partition. Anyway,
that is when you have to turn to third party partitioning software.
AOMEI Partition Assistant
Professional will assist you merge all unallocated disk space on the hard
drive to C drive without formatting or deleting any partitions. The unallocated space
generated after cloning could also be managed with it. You can even
allocate free space to C drive from existing partition with it. Moving unallocated
space to left or right side is also available.
It has graphical and clean user interface and is suitable for all PC users vary from
novices to professionals. Download to learn how to merge unallocated space to C
drive in Windows 7, for instance.
Move unallocated space to C drive without deleting partition
Step 1. To add non-contiguous unallocated space to c drive, install
and start AOMEI Partition Assistant. Right click C drive and select “Merge
Step 2. Check all unallocated space as well as system drive.
Step 3. Confirm the virtual outcome. Click “Apply” to execute the
There is one final confirmation, just click “Proceed”.
Since there is system drive involved in this operation, it will complete
allocating in restart mode.
You can move unallocated space to primary partitions by repeating those
methods as well.
To add unallocated space to C drive in Windows Server 2008/2003/2012 without
deleting, please refer to AOMEI
Partition Assistant Server Edition.
Believe it or not, you have successfully moved unallocated space to C drive in
Windows OS with AOMEI Partition Assistant. You have options to merge data partitions
say D, E drive to system drive as you wish using the same feature. As a matter of
fact, AOMEI Partition Assistant is capable of many other things, for example, you
are allowed to install
Windows 10 on external hard drive with “Windows to go Creator” wizard. When
upgrading hard drive, the “migrate OS to SSD” wizard matters a lot. You may also make SanDisk USB
bootable with “Windows To Go Creator” wizard and realize BYOD.