Does anyone know about how much disc space will the Windows 10 take up?

I've been looking into M.2. SSD:s and I'm planning for installing my OS in. And I've been wondering how much space i need in there to install windows 10?

Probably once everything is unpacked probably around 20GB but we won't know for sure when until the full version is installed.

ALL THE DISK SPACES. Once WINDOWS 10 is installed, Microsoft will then own ALL your hardware!!!! Mwhahahaha.

NTFS is a bad FS.