Windows 10: My Partition truned into Free Space after another unallocated space took its Letter

I accidentally named some unallocated memory into the letter of my data partition named "D". This turned the important partition into Free Space.Is there a way to return this partition?

:)

 

Partition space

You're not understanding this. Unallocated space is NOT equal as (partitioned) empty space.

Unallocated space means empty RAW sectors on HDD. Empty space means an already allocated file system (either FAT32 or NTFS or any other) that is not occupied by any data.

So in your case, as DanTheBanjoman already suggested, don't try to shrink "unallocated space", extend the main (C*Smile partition instead. You can't shrink something that doesn't exist (unallocated space), but you can extend the existing partition over unallocated space.
So, just select the C: partition and extend it further. Program should automatically allow you to do that. I'm not using Partition Magic, but i usually done this with either:
MiniTool Partition Wizard Free - manage and resize disk partitions (also for 64bit OS!)

or

EaseUS Partition Master - manage disk partitions (only for 32bit OS!)

 

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.