How to merge unallocated space in windows 10

It sounds like you've encountered a common issue with extending partitions in Windows 10. Let's go over what's happening and how you can resolve it.
Understanding the Issue:

• The "Extend Volume" option in Disk Management is only available when the unallocated space is immediately adjacent to the partition you want to expand.
• If the unallocated space is not directly next to the partition, the option will be grayed out.
• Sometimes, even if the unallocated space is next to the partition, certain types of partitions (like system or recovery partitions) or file system issues can prevent extending.

How  to Merge Unallocated Space with a Partition in Windows 10:
1. Confirm the Layout
Open Disk Management (Win + X > Disk Management).
Look at the graphical view to verify if the unallocated space is directly next to the partition you want to extend.

2. If Unallocated Space is Not Adjacent (or the Option is Grayed Out), Use Partition Management Software
Since Windows Disk Management has limitations, third-party tools are often more flexible.

To merge unallocated space in windows 10, please make sure the unallocated space is on the right side of the partition you want to extend (in Disk Management, the unallocated space should be immediately after the partition).