How to merge 2 unallocated spaces into one ?

cereberus said:

None of these posts mention the hidden MSR partition which usually cannot be moved even with partitioning tools. If this partition is between separate unallocated spaces, it is difficult to consolidate the unallocated spaces.

You can choose to delete it (pretty pointless partition anyway), or you can take a completely different approach using Macrium Reflect (trial version is fine).

1) image backup drive

2) Restore drive
a) In gui, delete all partition drag partitions to new layout in this order:
EFI, MSR, Recovery partition

b) float recovery partition to far right to leave all unallocated space between msr and recovery partition

c) drag C drive partition to unallocated space and select to expand it to fill space.

d) Do restore. Partitions are now in correct order and unallocated space sorted.

You can use other imaging tools but none of them are as slick as MR due to its drag and drop layout capability.

Absolutely correct, but there is another way to solve the problem. Delete the MSR partition. Move the EFI partition to the beginning of the disk. Recreate the 16 mb MSR partition after the EFI partition (easy to do in Diskpart and I think MiniTool Partition Wizard will also create MSR partitions). Then you will have the two unallocated spaces already merged together to create a partition in (or add to an existing partition on the disk).