brent tomscharbach are you kidding? you inspired all this but you didn't know. I had great success with your two OS/two DRIVES setup. Except I want to switch drives.
But dual-drive dual-boot (each OS on a different drive) is not what you are describing. You are describing single-drive dual-boot (putting both OS's on a single drive, albeit with two boot partitions):
brent Then for solus and bodhi (I think) it will be the standard pre-install partition drill:
-- sda1: 512mb (Solus boot, Fat32/exFAT, boot/esp flags set)
-- sda2: 100Gb (Solus root, ext4)
-- sda3: 512mb (Bodhi boot, Fat32/exFAT, boot/esp flags set)
-- sda4: 100Gb (Bodhi, root, ext4)
That's fine, and many people have had success doing so. I am not one of them. I used to dual-boot on a single drive, but could never keep it stable for more than a few months. That's why I switched over to installing each OS on a different drive, making sure each boot loader was not aware that the other existed.
My problem might have been, in part, that I was trying to set up two incompatible boot mangers (Windows Boot Manager and Grub), each of which seems to stop at nothing to hijack the boot process entirely.
Be that as it may, I haven't installed two OS's on a single drive in 4-5 years, and I don't remember all the factors that go into setting the two OS's on single drive. There is a lot of advice online (including on this forum) about the intricacies of setting up two OS's on single drive, and any advice I might offer about it would likely be outdated and inaccurate at this point.