To the right of Disk 0(Main Storage Drive), you can see a 450MB partition – labeled with Recovery Partition. Now, come to the bottom part of the Window. You can see that more than 500 MB is being used for those unlabeled drives. Look at the top of the window - you can see two more unlettered partitions along with two labeled drives. Here, I’m showing you my PC’s Disk Management console. Here, you can see how your hard drive partitions are allocated. (You can also choose this tool from Administrative Tools -> Disk Management). To access this utility on Windows 10, right click on Windows Start button and choose “Disk Management”. You can see the overall allocation of your hard disk partitions from Windows Disk Management utility. How to Find Hidden Partitions on Windows 10?

Let’s try to find out such partitions and allocate space occupied by them. This unallocated space will lie on partitions hidden by default.

You can't use such a disk space unless or until it is allocated into a simple volume. Due to improper partitioning or some other reasons, valuable hard disk space can become unallocated on your Windows 10 PC.

Diskmanagement windows 10