Does that mean the unallocated space cannot be merged to C drive?" However, when I right-clicked C drive, the option "Extend Volume" is inactive. In Disk Management, I shrunk D drive and got 100GB unallocated space which is between the Recovery and D drive. C drive is running out of space, so I want to move some free space from D to C. "Can someone here tell me how to allocate unallocated space to c drive in windows 10? The internal hard drive is 5GB and it is partitioned into 4 partitions, they are EFI system partition, C drive, Recovery and D drive in sequence. What is unallocated space and how to make use of it?
Bonus tip: How to recover data from unallocated disk space?. Solution #2: Merge unallocated space to an existing partition. Solution #1: Create a new partition on unallocated space. What is unallocated space and how to make use of it?. WAY OFF! If it can be wrong about that then I can easily imagine it being wrong about the maximum available amount of unallocated space. Much trial and error revealed the actual maximum available space to be 9222MB. WTF? It said 16102MB was the maximum available. Disk Management kept giving me the warning about the amount of space it said was available to shrink the volume being too much. I tried to shrink a partition so I could extend it(the same partition) using the newly created unallocated space. I just tried doing this same process to make sure I knew what I was talking about. So it might take A LOT of tries to get to the correct size. Sometimes Disk Management can be WAY OFF. That should, again should in italics, correct for Disk Management being retarded about reporting the actual amount of space available. If it still doesn't work, keep bumping it down 1MB at a time until it does. Try selecting 1019MB and see if it works. So if it's saying for instance that 1020MB is available, but that's giving you a warning when you try to extend the volume by that amount. Then when you try to enter that amount of space exactly you'll get a warning saying that's too much and it can't be completed. It will tell you X is the maximum amount of space available, when X amount is actually too high. What I've found is Disk Management can be wrong about the maximum available space. One thing I would try is when it asks you to select the amount of space in MB to extend the volume, select an amount slightly less than it says is the maximum available. It also shouldn't matter how large or small the available unallocated space is. You should be able to extend any non-boot volume/partition(or, in theory, even any boot volume/partition not currently in use) on the same drive to encompass the unallocated space available. Especially since we're talking about an SSD. It should make no difference if that unallocated/free space is contiguous with any particular partition on the drive. In your case I can't understand why it wouldn't. Because they're are times when that doesn't work. 
Well.that's why the italicized " should".
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