By Dervish / Last Updated March 10, 2022

Why allocate free space in Windows 11, 10, 8, 7?

When the hard drive is not well-partitioned at the beginning, many users are tend to encounter the problem of “low disk space” on system drive or other data partitions. As a result, some of them will upgrade small hard drive to larger drive to gain larger capacity. The other of them would like to reallocate free space from one partition to another partition to distribute free space in a reasonable way. Here is a real user case:

“When build computer two years ago, I had partitioned my hard disk. I thought I left enough memory for the system drive. However, with the increasing creating files and installing programs, computer gave me a low disk space warning on C drive. I don’t want to replace the hard drive with a new one currently and the D drive has redundant free space. What should I do to add the free space to C drive from D drive?”

Aforementioned problem is not uncommon in daily computing. In order to optimize the computer to get faster running speed and work correctly, many people try to find the best way to allocate free space to existing partition. Luckily, Windows Disk Management offers a way to allocate unused space, which might be a little bit circuitous.

Disk Management: allocate free space to another partition

1. Press+to open Run dialog, and then type “diskmgmt.msc” to open Disk Management.


2. If there is unallocated space next to the partition you’ll extend, just right-click that partition and select “Extend Volume”. Then, you’ll be able to expand that partition.

Extend Volume

3. If there is no unallocated space on the hard drive, to extend one partition, you need to delete its contiguous partition to get unallocated space and then do the volume extending. To guarantee data security, back up partition before deleting.

Delete Volume

Tips: If there is unallocated space at the end of hard drive, which is not adjacent to the partition you want to extend, you can try move partition through 3rd-party partition manager to change its location.

4. To retrieve the deleted partition, you can extend partition to the amount you need and put the left unallocated space aside. Next, create a new partition with the unallocated space and restore the backed up image.

New Simple Volume

As covered before, this program provides a roundabout solution for allocating free space from one drive to another in Windows. However, there is another way to allocate free space to existing partition without deleting or formatting inter-jacent partition or volume.

AOMEI Partition Assistant Professional is reliable partition software to help you allocate free space from one partition to another partition directly. The “Allocate Free Space” feature provides easy-to-use wizard and the entire process will be completed in a few steps. It is suitable for Windows 11, 10, 8/8.1, 7, Vista, and XP.

How to allocate free space to C drive without deleting in Windows 7?

Before you do all the procedures below, please download the free trial of AOMEI Partition Assistant first. Here is an example of allocating free space D drive to system C drive in Windows 7.

Step 1: Open it and you will see enough free space on drive D. Right click it and choose the button "Allocate Free Space".

Allocate Free Space

Step 2: The following picture will show up. It will give you the detail. Choose the size and destination drive you want.

Allocate From D To C

Step 3: Please check you procedures in "Pending Operations" on the sidebar. If there are some mistakes, you can click "Undo" or "Discard" on the toolbar. If all the operations are right, please click "Apply" to commit. After that, another window will show up. Please select "Proceed". The picture below shows all your operations are finished.

Apply Allocate Free Space

Just in a few minutes, you are able to allocate free space without data loss on Windows 11, 10, 8, 7. Apart from “Allocate Free Space” feature, AOMEI Partition Assistant Professional also provides other functions that can help you take advantage of free space on other partitions. For example, you can merge partitions that are contiguous together to make unused space in one partition, and this will not cause data loss because all files are stored in a separately folder.

AOMEI Partition Assistant Server is professional partition tool that can assist you allocate free space on Windows Server OS, like Server 2008, Server 2012, Server 2016, etc. Do you want to completely solve the unreasonable partition layout on your hard drive? Would you like a better operational computer? Now, download it to optimize your computer!