I had this happen on three different motherboards. So it seems that there
should be a procedure in the documentation that states if your BIOS doesn't
support EFI labels than you need to write ZFS to a partition (slice) not the
overlay, causing the BIOS to hang on reading the drive on boot up.
I had the same thing happen to me twice on my x86 box. I installed ZFS (RaidZ)
on my enclosure with four drives and upon reboot the bios hangs upon detection
of the newly EFI'd drives. I've already RMA'd 4 drives to seagate and the new
batch was frozen as well. I was suspecting my enclosure,
