I installed El Capitan Dev Beta 1 on a freshly erased and partitioned MacBook Pro Retina. In contrast to Yosemite and previous versions of OS X I realized that the "Recovery HD" partition is no longer showing up during boot (by holding down the "alt / option" key). You can however still boot into it by holding down "cmd" + "r" during boot - just as before. This is true both when you have encrypted your drive with FileVault but also when FileVault is disabled - thus differing from previous OS X versions. Now my question: Is there any way I can manually unhide a partition to show up for boot when holding down the "alt / option" key during boot? A look at diskutil in Terminal shows the "Recovery HD" is of Type "Apple_Boot" as it should be so I'm wondering if there are some hidden parameters that prevent it from being displayed. I'm especially asking since my goal is to create a dual boot system with Yosemite and El Capitan as well as their respective "Recovery HD" partitions. Experts help would be highly appreciated! Thanks in advance!