How can I divide one partition into two in Windows 10

To free divide partition in Windows 10 using the built-in Disk Management tool, follow these steps:
1. Open Disk Management:
Press Windows key + X and select Disk Management.
Or press Windows key + R, type diskmgmt.msc, and press Enter.

2. Locate the Partition to Shrink:
In the Disk Management window, find the drive you want to shrink (e.g., C:).

3. Right-Click and Choose Shrink:
Right-click on the partition and select "Shrink Volume...".

4. Enter the Amount to Shrink:
A dialog box will appear showing the total size of the partition and the amount of space available to shrink.
Enter the amount of space in MB you want to free up by shrinking the partition.
Click Shrink.

5. Unallocated Space Created:
After the process completes, you'll see unallocated space next to the partition in Disk Management.

6. Use the Unallocated Space:
You can now right-click on the unallocated space to create a new partition or extend an existing one.

You can only divide partition in Windows 10 if there is free space available and no files are actively using that space. If the Shrink Volume option is grayed out or doesn't free as much space as you want, some files or system files may be preventing the shrink.