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How to Merge C Drive and D drive in Windows 7 without Data Loss?

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    Situation: With more and more data stored to C drive of Windows 7, now this partition is nearly out of space. However, there are lots of free space on D drive, so I want to know whether it is possible to merge C with D so as to enlarge system partition of Windows 7.

    2 Ways to Merge C and D Drive

    Definitely, users are able to merge partitions, and there are 2 methods available. One is to use Windows built-in disk management tool, and the other is to ask third-party partition manager for help. Next, we will introduce these 2 methods in detail, and users can choose the most appropriate one in accordance with actual demands.

    Trick: these 2 methods can be applied to any version of Windows OS, not limited to Windows 7.

    Merge Drive C and D in Disk Management – Data Loss

    If users want to combine C and D via Disk Management, they need to backup all important data on D drive in advance, because this partition will be deleted. Naturally, all data saved in this drive will be lost. Do you want to backup data in a fast way? View the help tutorial Copy Partition to get instructions.

    Then, let's see how to merge partitions in Disk Management.

    Step 1: Right-click "Computer" icon on the desktop, choose "Manage" and click "Disk Management" to get its main interface as follows.

    How to Merge C and D Drive in Windows 7 1

    Step 2: Right-click partition D and then choose "Delete Volume" button to release unallocated space.

    How to Merge C and D Drive in Windows 7 2

    Step 3: Right-click partition C and then choose "Extend Volume" button. Then, extend volume C by following Extend Volume Wizard.

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    Why Is Extend Volume Grayed out and How to Quickly Fix It?
    Possible reasons for Extend Volume Grayed out are shown here, and users will be given corresponding solutions at the same time.

    From the demonstration above we know though Windows disk management tool can help us merge partitions, it will lead to data loss. unless we create a backup in advance. So well, is it possible to merge partitions without losing any data? Of course there is, and it is to make use of third party partition manager.

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    Merge C Drive and D Drive with Third Party Partition Manager – No Data Loss

    To perform such an operation, you can ask MiniTool Partition Wizard for help, which is a green, safe, and easy-to-use partitioning program for Windows users. It keeps existing contents in both partitions intact, and more surprisingly it’s free for Windows 10, Windows 8/8.1, Windows 7, and other Windows non-server users.

    Then, let’s see detailed steps.

    Step 1: Users need to launch MiniTool Partition Wizard to get its main interface as follows.

    merge c and d drive choose correct function

    Step 2: Select C drive and then choose "Merge Partition" from the left action panel to enter its operating interface. Actually, apart from merging C and D, users have another choice: extend drive C by taking free space from D, which could reserve D. Just select drive C, choose Extend Partition feature, take free space from D to enlarge C, and apply changes. The method is much simpler.

    merge c and d drive select the partition you want to expand

    Step 3: Click "Next>" button to get the following window.

    merge c and d drive select the partition that will be included

    Step 4: select partition D and click "Finish" button.

    Tip: all data saved in partition D will be placed to the Merged_partition_content folder and then saved to partition C, so no data loss will emerge. Of course, you are able to change the folder name here.

    merge c and d drive apply changes

    Step 5: Click "Apply" to perform all changes.

    After all operations are done, users have finished merging C and D drive in Windows 7 by using MiniTool Partition Wizard, and no data loss is generated.

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    Comparing these 2 methods, we can find resorting to third party partition manager is much better since it can help combine partitions without data loss. But for successful merge, please pay attention to the following 2 issues:

    • Drive C and Drive D should be adjacent.
    • Both partitions should be formatted with NTFS. If one of them is formatted with FAT32, please convert it to NTFS in advance.