Windows 10: Cannot change unallocated space into partition with drive letter

I want to create a new partition inside Windows 21H1 for a new Macrium backup until I can later get a large enough USB stick (in addition: I want both internal and external storage). I did take some unallocated space from C:/ -- cannot have storage destination in C.\ or any other disks being backed up! -- which is more than large enough for this but the only choice Windows offers is the Simple Volume Wizard which does not allow me.

:)

 

Unallocated Space to C Drive

Thanks

 

Unallocated Space to C Drive

Hi Travis,

It appears that a disk partition was created but was never assigned its allocation. Assuming there are no files stored in the unallocated partition, perform these steps to combine it with your C: drive:

• In Disk Management, right-click on (C which appears next to the
  Unallocated partition.
  
• Select Extend.

Let us know if you're able to combine the spaces after following the steps above.

Regards.

 

Not Getting Able to Merge Drive with Unallocated Space!

You should be able to right click on partition I:, in Disk Management, and select Extend volume... to add the unallocated space to partition I:. It should be as simple as that. You can't "merge" unallocated space with a partition, because unallocated space is not a partition. To "merge" 2 things those things need to be the same type of thing.

And no, it's not illegal to copy files to another drive.