How do I dual boot this?

[g7755726]

How do I?

[paidlowered]

You have to use MacriumRescue to partition your drive into multiple pieces and install a different OS on one of them.

[mhoffman54]

I tried and I get BOS when trying to boot into WinDeck. Thank God my SteamOS partition didn't get wiped, so I can still boot into that. With this install method, it seems WinDeck wants the entire drive or nothing at all.