Hi, Ben.
My apologies, I completely forgot about one very important aspect of all this
UEFI+Windows business: the bootloader rely on the GPT partition GUIDs which
were regenerated from scratch when GPT was restored.
I believe it's still possible to restore the required GUIDs and make Windows
boot without reinstalling it.
Please, download the ROSA KDE R4 64-bit iso (maybe, OM will also suffice but
with ROSA I just know for sure what works and what doesn't), write it on a USB
flash drive and boot Live mode from it in UEFI mode (this is important: when
booting in UEFI you will see Grub menu with nice theme, ROSA logo, etc. - if,
instead, you are seeing text-mode menu with Troubleshooting submenu, it's
syslinux, and the scenario below won't work).
After you booted, open Konsole and run:
# efibootmgr -v
The output should contain one or more Windows entries which look like that:
Boot000D* Windows Boot Manager
HD(2,1f4800,82000,694f0dc5-0502-4bbb-8a2f-d07fc767c2d0)File(\EFI\Microsoft\Boot\bootmgfw.efi)WINDOWS.........x...B.C.D.O.B.J.E.C.T.=.{.9.d.e.a.8.6.2.c.-.5.c.d.d.-.4.e.7.0.-.a.c.c.1.-.f.3.2.b.3.4.4.d.4.7.9.5.}...3.............^?...
What you need here is the GUID in the HD(...) parameters - in my example it's
"694f0dc5-0502-4bbb-8a2f-d07fc767c2d0". Now start `gdisk /dev/sda' and assign
this GUID to your EFI partition (x, c). After saving the partition table try to
reboot into Windows: the bootloader should be able to start, and hopefully it
will initiate restoring the rest of the Windows partitioning metadata.
OK, results:
# gdisk /dev/sda
Partition table scan:
MBR: protective
BSD: not present
APM: not present
GPT: present
Found valid GPT with protective MBR; using GPT.
I believe that's what I need. Windows 8.1 OS is still there but won't boot
which I expected. So I'm going to need to reinstall 'dows 8.1 again, which I
expected. However my ding dong computer did not come with a reinstalll disk. So
I hope I can get that from either ASUS (ASUS X550CA notebook) or the beloved
ones at Microsoft. I will be very surprised if that doesn't cost me some $. Ok
take one for the team.
Konstantin this is important because Colin Close and I are trying to dial in
OpenMandriva support for efi/uefi and also multibooting with Windows. Your help
has been invaluable. Any more input will be much appreciated. We seem to have
much in front of us.
Colin: unless and untill I have the wherewithall or whatever to reinstall
Windows 8.1 we're paused. I will work on that as time allows. The positive side
is I'm learning a lot about 'dows and how to munipilate it and gdisk and other
stuff that may lead to incontrovertible results. And that, to me, is the goal.
So I am forced to learn more about the windows side of these issues as well as
learning the GPT (gdisk is to GPT as fdisk is to MBR) stuff, the UEFI stuff,
and so forth. I have a lot of aforementioned man pages bookmarked for study...
Obviously I'm dealing with a major learning curve. Any one out there help me if
you can. I darn sure need it.
Thanks,
Ben
ben79
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Bye. With best regards,
Konstantin Vlasov._______________________________________________
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