1.) Right-click on Computer, then go to Manage ==>Disk Management in Computer Management.

2.) Click DATA (D:) ==> Shrink Volume.



3.) Specify the amount of space you want to shrink in Enter the amount of space to shrink in MB and then click Shrink.



4.) A new free space will appear in Disk 0, right-click this free area and click New Simple Volume.



5.) Follow the New Simple Volume Wizard and click Next ==> enter the size in Simple volume in MB.
If you want to add more than one partations, please leave some space here.
If you just want to add one partition, please click Next.



6.) Follow the wired to assign the drive letter and format partition to finish the setting.