Combine Partitions Site
In most cases, the two partitions must be adjacent (next to each other) on the disk map for a standard merge to work.
If the unallocated space is to the left of the partition you want to extend, the "Extend Volume" option will be grayed out. Windows native tools cannot extend a partition "backwards." For this, use Method 2. combine partitions
Are you looking to merge partitions to fix a error, or are you just reorganizing a secondary storage drive? In most cases, the two partitions must be