Incorrect Disk Partitioning During Installation The issue mainly occurs when you wrongly partition your storage driver while Windows installation. As you know, during the Windows setup, you can partition your storage disk and select a storage drive to install the OS. However, it can happen if you made an incorrect disk portioning during Windows installation. 2. Accidentally Installing an Operating System on the Wrong Disk While installing Windows, you probably have selected the wrong partition and installed Windows. This is a common error. Because when you partition your C driver during Windows installation, it creates additional storage disks. And if you had selected the wrong one, the issue would occur.