Thereby, you will have more disk space to store and organize files.
Now, you’re able to keep reading to learn how to add unallocated space to D drive.
How to Add Unallocated Space to D Drive
Way 1. you’re able to use this utility to add unallocated space to a partition.
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How to add unallocated space to D drive with Disk Management?
See detailed steps below.
Right-click theWindows logobutton to selectDisk Management.

Right-click theDpartiiton located to the left of the unallocated space and selectExtend Volume.
Adjust the amount of space you want to add to the D drive from unallocated space and clickNext.
Way 2.
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Here is a true example:
In such a situation, MiniTool Partition Wizard is highly recommended.
MiniTool Partition Wizard FreeClick to Download100%Clean & Safe
Step 1.
Launch MiniTool Partition Wizard Free.

Step 2. grab the D drive, then scroll down to chooseExtend Partitionfrom the left panel.
In the new window, launch the drop-down list ofTake Free Space fromand choose the target unallocated space.
After that, drag the handle to adjust the new size of the D drive.
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Preview the disk expansion effect.
If it meets your requirements, click theApplybutton located in the lower left corner to apply this change.
Alternatively, you could use theMove/Resize Partitionfeature to move adjacent unallocated space to the D drive.

Is it possible to delete/remove unallocated space in Windows 10?
The answer is Yes.
This guide will show you how to delete unallocated space.
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Way 3.
In the Windows search box, typecmd.
Then right-clickCommand Promptfrom the best match result to selectRun as administrator.
In the new window, bang out the following command lines.
Remember to pressEnterafter each command line.
Finally, typeexitand pressEnterto kill the Command Prompt window.
Hope it’s possible for you to extend the D drive successfully after implementing the approaches above.