[Trisquel-users] Re : Installing Trisquel and gentoo on another drive, grub required?.

[lcerf]

Are we talking about two internal drives? If so, do not worry: the last  
installed distribution will populate GRUB's configuration with all available  
systems. I am not sure what happens with a USB external drive.

By the way: Gentoo can be 100% free. Not by default though. You need the  
"deblob" keyword in the USE variable and ACCEPT_LICENSE="@FSF-APPROVED  
@FSF-APPROVED-OTHER". All that can be defined in /etc/make.conf.