how to extend system partition?

launch MiniTool Partition Wizard and we can see all partitions in the computer, all follows.

 you can see there is unallocated space (marked by *) but it is not adjancent to partition C: (system partition). So I have to move it. Then select Partition E: and click "Move/Resize" boxed on the left, as follows.

After clicking "Move/Resize Partition", we'll see the following window.

Move the partition rightward and then click "OK". We'll see the following effect.

we can see the unallocated space is next to Partition D:. Then seelct D: and click "Move/Resize Partition" again. repeat the previous operation and finally we get the following effect.

Now, the unallocated space is next to C:. so select C and click "Move/Resize Partition" to exend C:, as follows.

 Drag the right arrow rightward to increase C:. then we'll see the following effect.

C: has changed from 30GB to 90GB. remember to click "Apply" to achieve it.


Notes:
1. To extend a partition, there must be unallocated space. if there is not, we can delete or shrink a partition to get the unallocated space.
2. the unallocated must be adjacent to the partition to be extended. "Move/Resize" function can make this goal.