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How to Merge Unallocated Space to C Drive without Losing Data?

Scenario: I have a Windows Server 2008 R2 Enterprise. The Disk 0 is 116GB, partitioned as C: drive (System, Boot, Page Files) and D: partition for data. Now C: drive is running out of space, but D: partition has a large amount of free space. In Disk Management, I can shrink D partition to generate 30GB unallocated space. However, when I right-click C: drive, the Extend Volume grayed out. How can I merge unallocated space to C: drive?


Why the "Extend Volume" function is unavailable? In general, the "Extend Volume" only works with contiguous unallocated space on the right side of the partition you would like to extend. To solve this restriction, there are two solutions:

Solution 1: Merge unallocated space to C drive with Partition Magic Software without losing data. (Recommended)

Solution 2: Backup D partition and delete it. Then, merge unallocated space to C drive with Disk Management snap-in.

Solution Comparison: The solution 1 is a proven and common way which enables you to merge unallocated space easily and safely in Windows Server 2000, 2003, 2008, 2012, Windows Home Server 2011, Windows Small Business Server 2003, 2008, 2011, Windows 8 and 8.1, Windows 7, Vista, XP, 2000. However, with the solution 2, you have to backup, delete partition and restore data. It is indeed time-consuming and unsafe. What’s worse, this solution only applies to Windows 8, 7, Vista, 2008 since there is no resize feature in Disk Management snap-in of Windows 2000, XP, 2003.

Two solutions to merge unallocated space to C drive partition

You can select either of the above two solutions to merge unallocated space to C drive based on your own conditions.

Solution 1: Merge unallocated space to C drive with Partition Magic Software

As Partition Magic alternative, Partition Assistant is an ALL-IN-ONE magic partition solution and reliable disk management toolkit. It allows you to resize, move, split, merge, copy partitions, allocate free space, extend NTFS system partition without rebooting, copy disk without reinstalling Windows, convert FAT partition to NTFS and much more... The following is a step by step instruction on how to merge unallocated space to C drive:

Step1: Choose the right version and install it. Then, launch it. All the hard disk partitions that connected to your computer and capacity, used space, free space, other properties of each partition are shown as below:


Step2: Select C drive. Right click on it and select "Merge Partition" in the drop-down menu.


In the pop-up window, choose C drive and unallocated space that you want to merge in the partition layout (Tips: here you can also choose D partition simultaneously, learn more how to merge two partitions).


Step3: Click "OK". You can preview the unallocated space initially at the end of the disk is merged into C drive. To save the change, please click "Apply" button on the toolbar.


At last, you will receive a message, saying "All of operations have been completed successfully".


It is very easy and safe to merge unallocated space to C drive with Partition Magic Server software - Partition Assistant Server Edition. Based on different operating systems and availabilities, there are Pro Edition, Server Edition, Unlimited Edition and Technician Edition. Learn the differences and limitations by comparing editions. Besides, you can free download partition magic demo version to try before you buy the full version.

Solution 2: Merge unallocated space to C drive with Disk Management in Windows 8/7/Vista/2008

Step1: Backup data and files in D partition.

Step2: Right-click "Computer" -> "Manage" -> "Storage" to open Disk Management.


Step3: Right-click on D partition and select "Delete Volume".


Step4: Then, there is a block of unallocated space behind C drive. Right-click C drive and select "Extend Volume". Follow the "Extend Volume Wizard" to merge unallocated space to C drive.


Compare with Disk Management, it is obvious that Partition Magic Software is more convenient and safe to merge unallocated space to C drive.

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