Heading out to the Falklands next January and want to set-up a Dualboot system with MacOS Sierra and Linux distro KDE neon. The main OS will be KDE neon with the MacOS as a backup for incompatible software and AirPlay functionality. All media i.e. Videos and Music will be stored on an external USB 2.0 HDD. My question to the community is: What allocation to the Linux Os should I give as the main operating system while still having a functioning MacOS running a clean install? I don't intend on installing any additional software to the Mac side unless absolutely necessary. The HDD is 128GB. Any suggestions and reasoning welcome.