In Windows 10, there can be a Windows recovery partition or computer manufacturer OEM factory recovery partition available on the Windows disk.
Windows Recovery Environment (WinRE) is a recovery environment that can repair common causes of unbootable operating systems. By default, WinRE is preloaded into the Windows 10 for desktop editions (Home, Pro, Enterprise, and Education).
The default partition layout for UEFI-based PCs is: a system partition, an MSR, a Windows partition, and a recovery tools partition.
If you have more than one recovery partition or have an old invalid factory recovery partition, then you can delete a recovery partition you do not want or need to reclaim disk space.
This tutorial will show you how to safely delete the Recovery Partition in Windows 10.