By Emily / Last Updated November 11, 2021

Unallocated space after cloning

“I originally had a 500GB HDD and suddenly my PC kept freezing with the HDD lights staying on. So I immediately thought that the drive was about to fail. I immediately bought a 1TB Samsung SSD and cloned the old HDD to the Samsung using some software. Here is the problem: After cloning and replacing the HDD with Samsung, Windows only sees (in Windows Explorer) and allows me to use 500GB of the Samsung drive. However, if I go to Disk Management, Windows recognizes it as a 1TB drive and there is also an unallocated space after the 500GB partition. I'm not sure why this is and how to fix it. Does anybody know how to deal with this?”

Do you have the same confusion after cloning hard drive to Samsung SSD or to other kinds of hard drive? The most possible corresponding answer would be, you clone the old drive byte for byte. You get the same layout because you cloned exactly the same file system and partition tables. That’s what you ended up with, an exact copy of the original partition. Besides, the unallocated space may exist before and after the cloned partition.

How to use unallocated space after cloning HDD or SSD?

If you get a piece of unallocated disk space after you clone hard disk to larger HDD or SSD, you will not be allowed to use it for data storage. So, how to make use of the unallocated space? Actually, it is pretty easy. You have different options in different situations.

If you have unallocated space right behind the cloned partition, then use Disk Management.Right click the nearest partition that next to the unallocated space. Select Extend Volume. In the pop-up window, you are able to drag the arrow to the end of the box.

Extend Volume

Alternative way is to create new simple volume with the unused space. Right click the space, and select New Simple Volume. The rest to do is following the wizard.

If the unallocated space is distributed throughout the hard drive, you can switch to a free partition manager. Here I would like to recommend you using AOMEI Partition Assistant Standard. It is free without any bundled adware for Windows 7/8/10/11 and Windows XP/Vista users. It allows you to merge multiple unallocated spaces into one partition as well as create new partition with the unallocated space. Download it and have a try.

Download Freeware Win 11/10/8.1/8/7/XP
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Merge unallocated space into partition after clone

Step1. Install and start AOMEI Partition Assistant Standard. Right click the partition you want to merge to, and select Merge Partitions.

Merge Partitions after Clone

Step2. Check all the unallocated space.

Tick All Unallocated Space

Step3. Click Apply to put the operation into practice.

Apply Merge Partitions after Clone

Don’t be panic when you find your hard drive “lost” a big part of disk space which shows as unallocated space after cloning. You cannot find it in Windows Explore, but it does exist. Just find a way to unhidden it and make good use of it. With this freeware AOMEI Partition Assistant Standard, you can shrink C drive, make bootable CD, format/create/delete partition, and create W2G (Windows to go) for Windows 11 and Windows 10, etc.

Since you have solution to dealing with unallocated disk space after migrating, you can use AOMEI Partition Assistant Professional to do some preparation before cloning. For instance, allocate free space from D drive to C drive to keep enough room for operating system.

Further reading: how to deal with unallocated space after format?

Besides unallocated space after cloning SSD/HDD to larger drive, you may also get unallocated space after formatting one hard drive or partition. You have ways to allocate unused disk space. If you formatted an entire hard disk, quick partition the hard drive would be the best choice for you. This can be done via AOMEI Partition Assistant Professional.

Quick Partition

If you formatted merely one partition, then create a new partition or allocate unallocated disk space to other partitions will work for you.