Merge C and D

Combine C and D drive in Windows Server 2012

Advantage of combining C and D drive

As we know, to use disk space more efficiently or improve server performance, you’d better create at least one separate volume in the same disk of C drive. If you use single C drive and put everything into it, it’ll cause many issue in the future. On the contrary, if you create more volume in the same disk, it means that C drive is smaller, so it is more likely running out of space.

Some people wondering if it is possible to merge C: and D: drive together, so the free space of D will be transferred into C drive. Yes, it is possible and this is the advantage of merging these drives. However, it is not the best solution if you want to extend C drive on Windows Server 2012. In this article, I’ll show you how to combine volumes C and D in Windows Server 2012 (R2). I suggest you read the entire article and then decide what to do.

How to merge C and D drive

It is very easy to merge partition C: and D in Server 2012, just several clicks are needed, steps:

Download NIUBI Partition Editor Server, you’ll see all single partitions and the corresponding parameters on the top, all connected disk with partition layout on the bottom, and available operations on the left.

Merge C and D

Right click either partition C or D, and then select “Merge Volume”, select both drives in the pop-up window.

Select C and D

When merging C and D drive, you can only merge these drives to C. If you select D in the drop-down box, you’ll receive error message.

Merge error

If you merge volume C into D, C will be deleted, it will cause system boot failure, so this operation is disabled.

After click OK, this program will back to the main window automatically, where you’ll see that drive D merged into C.

C and D merged

If you want to do like this, you should click Apply on top left to execute, otherwise, physical disk partitions won’t be changed.

Open C drive in Windows Explorer after merging complete. You’ll see a new folder named as “D to C(date and time)”, all files in original drive D will be moved into this folder automatically.

Check after merging

Disadvantage of merging C and D drive

It is easy to merge C and D volume in Windows Server 2012 indeed, but as you see, D drive will be deleted. That means, all Windows services and applications in D become invalid, though files moved into C drive.

The best idea is shrinking D to extend C drive, that means, release free space from D and add into C drive, so drive D won’t be deleted and everything keeps the same. Watch the video how to do this:


Besides merging and resizing disk partitions, NIUBI Partition Editor can help you do many other disk partition management, such as create, delete, format, covert, defrag, copy, hide, wipe, scan partition, initialize and set read-only attribute to disk, etc.

How to merge C and D drive in Windows Server 2012?
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