Triple boot:XP,ubuntu&FC5 grub failed

[Jim Cornette]

Tod Merley wrote:
> On 9/6/06, Mike McCarty <Mike.McCarty at sbcglobal.net> wrote:
>> Tod Merley wrote:
>> > Hi Gayal Rupasinghe and Jim Cornette!
>> >
>> > Gayle, Jim has it pretty much right I think.
>> >
>> > The chainload of Ubuntu (sort of a "stop looking here and start fresh
>> > right there!) should see a Fresh MBR (this is were I have a bit of a
>> > question since I can only see an MBR as being generated for the first
>> > sector of the disk) immediately followed (and referenced in the MBR)
>> > by a file within your current /boot/grub called "reiserfs_stage1_5".
>>
>> [snip]
>>
>> Erm...
>>
>> There is exactly one (1) MBR per physical fixed disc. Each non-extended
>> partition has a BR on it (sometimes called the geometry). GRUB
>> can run either from the MBR or from a BR. Extended partitions are
>> another story altogether.
>>
>> Mike
>> -- 
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>>
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> 
> Hi Mike McCarty!
> 
> So when you use a GRUB prompt or grub-install you can form a Boot
> Record on any of the four Primary Partitions (the very first one being
> the Master Boot Record of course)?
> 
> How do you make sure it is formed for the partition and knows were the
> proper stage 1.5, stage 2, and grub.conf or menu.lst are?
> 
> Thanks!
> 
> Tod
> 

Lokking through the replies, I did not see mention of what installs the 
basics for the bootloader.

When you run grub-install /dev/hdx# from any of your installations, 
information is installed for grub to finis booting. So when you install 
grub into /dev/hdb2 for example, information for grub and the first 
stage is chainloaded. (given over control to the particular OSes version 
of grub.) From there, it loads the consecutive stages in a similar way 
that installing grub into the MBR does. If grub is not installed into 
the MBR, the partition where you installed grub into must be marked as 
active. BIOS will take it from there to start grub from a partition 
where it is installed, consecutively going through the various stages 
grub goes through in order to load the OS.

Jim

-- 
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