Broken Windows startup after repartitioning drive I run Windows 10 on my boot camp partition. Yesterday I created a new partition on my disk to store my shared documents between two operating systems by resizing the OS X partition.

Today I noticed that Windows doesn't load.



I have the installation media but didn't want to mess with partitions as I know nothing about how boot camp works.

Is there a way I can repair my Windows installation or do I have to reinstall?
One should never try to change drive partitions under Windows (Boot Camp): this makes Windows unbootable. I do afraid that now you have to re-create boot camp partition and reinstall Windows. 

Anyway there're (proved by people) ways (see links 1, 2, 3) to achieve what you want. 

PS. I personally prefer and recommend external Thunderbolt drive for the 3rd partition shared between mac/windows