I have fully functional Windows and Ubuntu that is broken (I accidentaly broke it) and want to do reinstall. 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: Install Ubuntu alongside them 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.