On 09/05/14 19:57, James wrote:
Todd Goodman <tsg <at> bonedaddy.net> writes:
What does 'gdisk -l /dev/sda' say about GPT and MBR (it usually says
whether you have a valid GPT and/or MBR before printing information
about the partitions.)
gfisk does not seem to be in the tree. That's the old name for the
"gptfdisk" now in the portage tree. The name is now consistent
with upstream. (/sys-apps/gptfdisk)
As others have mentioned, you need that BIOS boot partition for GRUB2 to
embed its core.img into since there's no post-MBR gap for it to use with
GPT. This is different than the partition you mount as /boot.
Your BIOS should be able to boot GPT drives but it can be flaky
depending upon motherboard in my experience.
If using GPT drives to boot with BIOS you want a protective MBR which
encompasses the entire drive (or first 2.2TB if the drive is larger than
that as that's as big as MBR can handle.) It has type 0xee.
You can create that gdisk (by going into the eXpert menu) or you can use
fdisk to create it.
Maybe gdisk is on the installation iso? It's not in the portage tree, but
it use to be:
http://sources.gentoo.org/cgi-bin/viewvc.cgi/gentoo-x86/sys-apps/gdisk/?hideattic=0
gdisk and gptfdisk are the use the be the same software..
With a GPT partition and old BIOS 2008 system, I need to set the bootable flag
on the protective MSDOS partition. Thats all the BIOS can see.
I need to use an older fdisk and ignore the dire warning about a GPT partition
table being detected.
But where to find older fdisk and in stall it from chroot environment.
--
Joseph
