dual boot - How do I find out on which partition is my Windows?

I have fully functional Windows and Ubuntu that is broken (I accidentally broke it) and want to reinstall Ubuntu. With Live-CD, I can see:

• 3 NTFS partitions,


• one ext4 and


• one unknown.

How do I find out which partitions belong to Windows? I thought that I might delete everything that wasn't NTFS, but I was afraid. Now I am using the Install Ubuntu alongside [existing systems]... option, but I guess that this will leave my broken Ubuntu untouched. So, again, I need to know which partitions to merge (perhaps add partitions of broken Ubuntu to new Ubuntu?).

Please, how can I learn how my system is divided? Thanks a lot.