Can I install both High Sierra and Mavericks on my Mac? I have a 2013 MacBook Pro with both Mavericks and El Capitan installed (each on their own partition).

I now want to use Mavericks and High Sierra, each on their own partition.

Since High Sierra uses the APFS file system, will this prove to be a problem? Will it conflict with the HFS format use in Mavericks?

If there would be a conflict, how could I use both High Sierra and Mavericks on the one MacBook?
You do not have to use APFS to run High Sierra. Although, I believe if your internal drive is  a SSD, then the High Sierra installer will try to convert the existing El Capitan partition and El Capitan Recovery partition to a APFS container partition.

Upgrading El Capitan to High Sierra should not effect Mavericks.


  Note: Mojava (macOS 10.14) will be released on September 24, 2018