Robert Heller wrote: > At Tue, 29 May 2018 06:47:06 -0700 CentOS mailing list <centos at centos.org> > wrote: >> On 05/29/2018 06:33 AM, Robert Heller wrote: >> > >> >> The UUID in the EFI boot options is >> >> 99E275E7-75A0-4B37-A2E6-C5385E600CB, which >> >> does not to match anything, but the system is only happy booting the >> >> old disk... >> > And at this point, it will only boot in legacy mode off the old disk. >> >> That's what I meant, I think.'?'? Legacy mode is BIOS-compatible.'?'? If >> you're booting in legacy mode, you can't access the UEFI variables. The >> old disk probably has GRUB installed on the first block.'?'? It might be >> booting in legacy mode *because* the UEFI boot option's UUID doesn't >> match your partition. > > OK, I think at this point it is not wanting to even boot the old disk in > EFI mode. Maybe because the old disk is no longer in SATA port 0 (/dev/sda). > It is not wanting to boot the new disk in EFI mode and won't boot from the > Optical disk in EFI mode (at least I cannot figure out how to do that). <snip> Y'know, what you just wrote above... that makes it sound like you need to go into the BIOS and reset the boot order. mark