But how to partition the C drive in Windows 10?
This post shows you how to check disk partitions in Windows 10.
Besides, you might learn how to recover deleted/lost drive partitions here.
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Way 1.
Shrink the C Drive
The easiest way to partition the C drive is to shrink it.
On the taskbar, right-click theStartbutton and selectDisk Management.

Find and right-pick the C drive and select theShrink Volumeoption from the context menu.
In the new window, enter the amount of space to shrink and then click theShrinkbutton.
Once the C drive is shrunk, there will be an unallocated space available.
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Now you gotta right-nudge the unallocated space and selectNew Simple Volume.
After that, click theFinishbutton, and the D drive should exist.
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.
In such a situation, is there another way to partition the C drive?

Of course, the answer is Yes.
Download MiniTool Partition Wizard Free and start to create D drive from C drive.
MiniTool Partition Wizard FreeClick to Download100%Clean & Safe
Step 1.

Launch MiniTool Partition Wizard to enter its main interface.
Step 2. choose the C drive, then clickMove/Resize Partitionfrom the left menu bar.
Drag the handle to the left to shrink the C partition.
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Once the volume space is specified, clickOK.
Next, snag the unallocated space and clickCreate Partition.
Specify the partition label, file system, and partition size, and choose the D drive letter.

Click theApplybutton located in the lower left corner to make all the changes take effect.
This post describes how to change partition to primary using diskpart and a diskpart alternative partition management tool.
Way 2.

The major steps are as follows.
On the home page of MiniTool Partition Wizard, snag the C drive and clickSplit Partition.
Drag the slider bar leftwards or rightwards to determine the size of the original partition and the new partition.
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After that, clickOK.
Finally, click theApplybutton.
MiniTool Power Data Recovery Free can recover 1 GB of files for free.
ThePartition Recoveryfeature is only supported in thePro Platinum Editionor more advanced editions of MiniTool Partition Wizard.
MiniTool Power Data Recovery FreeClick to Download100%Clean & Safe
Videos on USB are lost or deleted?
Read this post to get the most effective solutions to recover deleted videos from a USB drive.