[Bug 211715] Some computers can not boot – no file system found (e.g. 'Non-System disk or disk error …') – where the GPT and partitions are created by gpart(8)

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=211715

--- Comment #3 from Graham Perrin <grahamperrin at gmail.com> ---
Another workaround, good for most cases: 

Use gdisk <http://www.rodsbooks.com/gdisk/> to relocate backup data structures
to the end of the disk. gdisk is included with GParted Live. 

So far I have encountered four computers that will not boot a FreeBSD-based
operating system without post-installation attention to the GPT. Two HP, two
Apple. 

----

The most recent case is the first for which gdisk relocation of backup data
structures was _not_ a workaround. 

HP EliteBook 8540p with recently released GhostBSD 10.3
<http://www.ghostbsd.org/10.3_enoch>. In this case I took the same approach as
in https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=211715#c2 above. 

Specifically, I booted GParted Live from a USB flash drive then used GParted
to: 

a) shrink the fat16 file system 
   /dev/sda1
   by 1 MiB (from 100 to 99 MiB); and then 

b) create a corresponding amount of free space before that partition.

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