[Bug 221674] Installer can't back up when it finds MBR

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=221674

--- Comment #2 from MMacD <scratch65535 at att.net> ---
If the installer can't back up because it's really 2 different, dedicated
installers, defaulting (currently) to EFI/GPT, would CSM solve the problem of
having an MBR disk where the human DOES want to convert it to GPT? 

If not, maybe a "pre-installer" is needed that can take a look at the situation
and offer choices?  E.g.: 

"Your disc is MBR and seems to have something on it, perhaps another operating
system that you want to dual-boot, or some important data that should not be
destroyed.  Please choose how to proceed:

[ ] stop the installation now so that you can switch discs.

[ ] keep the MBR partitioning and existing data.  Create an additional
partition and install FreeBSD into that new partition.  [ ] The original
partition holds an operating system. Install the FreeBSD boot manager.

[ ] keep the MBR partitioning, but discard the existing data. Re-format the
existing partition and install FreeBSD there.

[ ] convert the disc to GPT.  This will erase EVERYTHING on the disc, including
the MBR partitioning and all the existing data.  Then install FreeBSD.

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