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Re: Grub refuses to hide/unhide

From: Simon Detheridge
Subject: Re: Grub refuses to hide/unhide
Date: Thu, 03 Apr 2008 15:07:27 +0100
User-agent: Internet Messaging Program (IMP) H3 (4.1.5)

Thanks, I'm still using grub 1.

As you can see from my example below, the numbering is correct. For example, I can say: "root (hd0,0)" from a prompt, and it says there's a partition there and tells me the type (0x07 or 0x17 depending on what I set in fdisk) -- It's just that then when I say "hide (hd0,0)" it fails.

That's the puzzling thing. "hide" says "no such partition", where "root" can clearly see one.

Quoting Franklin PIAT <address@hidden>:


What version of grub do you use ?

In case you switched to grub2, note that the partition numbering has
changed (to match linux numbering) :
? +-----------+---------+---------+
 | linux*    | grub1   | grub2   |
? | /dev/sda1 ?| (hd0,0) ?| (hd0,1) |
? | /dev/sda2 ?| (hd0,1) ?| (hd0,2) |
? +-----------+---------+---------+


*) YMMV : It could be /dev/hda*

On Tue, 2008-04-01 at 20:40 +0100, Simon Detheridge wrote:
I have a multi-boot system and Grub has started acting up. I haven't
touched my grub installation since it was last working. I did an
'emerge -uD world' from Gentoo, but I wouldn't have thought it
installs a new grub loader without asking me first.

Anyway. The problem is that on my first drive, I have 4 partitions. 3
NTFS ones, and an ext2 partition for /boot. When I boot some flavour
of Windows, it hides two of the NTFS partitions, and unhides a third.
Everything was working fine until yesterday, but now it refuses to
hide/unhide the partitions.

It says:

   hide (hd0,0)
   22: No such partition

BUT - if I drop to a console, I can see the partitions. But if I try
and hide/unhide from there, it still complains. Example:

   > root (hd0,0)
   Partition type: 0x17
   > unhide (hd0,0)
   22: No such partition
   > root (hd0,2)
   Partition type: 0x07
   > hide (hd0,2)
   22: No such partition

Note: The above output isn't exact. I'm remembering it from what
happened, but you get the idea.

If I boot back into Gentoo, and set the partition types
(hidden/unhidden) manually using fdisk and then reboot, then edit the
grub commands at the grub prompt to remove all the hide/unhides, it
works, and I can boot my OS.

Any ideas?


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