What will you do if there is free space, say 15GB, on the disk which is not large enough to create a new partition? I think the best solution is allocating it to other partitions.This can be carried out by two methods.
Solution 1: use partition manager
Solution 2: use Disk Management
Step1:Go to Disk Management. Right click Computer and select “Manege” as in the picture:
Step 2: Then you’ll see the 15GB free space in Disk Management.
Step 3: Right click C drive and select the item “Extend Volume”.
Step 4: Follow steps of Extend Volume Wizard.