Thank you so much for your reply, @YannBuntu!
Originally Posted by YannBuntu
Actually, there are two comments to be made here:
Boot Situation: I'm not sure how much of the thread you have followed, but my situation is now changed (see edit below for details) - Each drive is independently bootable from the UEFI boot override menu; I reformatted/reinstalled each OS individually with only its drive connected.
Therefore, I (believe) I have two separate, functioning EFI partitions (ESPs?). One on the windows disk, and one on the ubuntu disk.
Again, you're the expert, but I BELIEVE this makes things much simpler? As in install another Grub2 in my Windows disk and have IT call ubuntu's file? This would be preferable for part 2:
Ubuntu Disk Removal: That is, unfortunately, exactly what I want I forsee the need to move the ubuntu disk out to a separate physical box in the near (read few months) future, so it'd be nice to avoid breaking Windows if it can easily be helped.
EDIT: This may not be as clear as I'd like to make it so when I go home I will re-run the boot-info script so you get a clear picture of my situation. However, here is a hopefully better explanation in the interim:
the exact partitions are from memory, so I may have missed something (swap may be at the end of the drive, I used automatic ubuntu install), but the general gist is valid
sda: | EFI (vfat) | NTFS (Windows) |
--- GPT, UEFI, 240GB Intel 520 (boots fine when "UEFI: Intel 520..." is
selected in UEFI menu or if i leave it alone - it is first in the boot order)
sdb: | NTFS | NTFS | ext4 |
--- GPT, data disk, 3TB Seagate (all partitions can be seen by both OSes, even
if Windows doesn't recognize the ext4)
sdc: | EFI (vfat) | linux-swap | ext4 (/) |
--- GPT, UEFI, 64GB Crucial m4 (boots fine when "ubuntu" is selected in UEFI
menu. Must be chosen because default boot order loads windows)