Re: [gentoo-dev] question about grub

[Dan Armak]

On Friday 15 March 2002 20:00, Ryan McLean wrote:
> Hello,
>
>   I was reading your excellent installation documentation online, and I
> ran into a question.  Near the end you're breaking down the commands for
> grub, but you leave some information out that I would like to know:
>
> # Below needed only for people who dual-boot
> title=Windows NT Workstation
> root (hd0,5)
> chainloader +1
>
>   I'm unclear as to what the (hd0,5) are pointing to, is to say "boot of
> off the FAT partition located at partition 5"?  Normally MS likes to
> reside on the primary partition of the drive, so I just want clarification
> on this.  For instance, if I have a dual boot, MS on the primary partition
> and Gentoo's root at (sd0,3), then I would put root (sd0,1) under my
> Windows boot section, correct?  And also, what does the chainloader +1
> command do?  Thank you fo your time, I'm an old fan of lilo, but I have
> been cosidering migrating to a newer bootloader :)
One thing you must be careful with is the partition numbers. In grub, unlike 
the /dev/hdxy devices, the first partition is numbered 0 not 1. So (hd0,5) is 
first harddisk, sixth partition.

chainloader +1 boots a partition that has custom boot code in its boot sector. 
In our case, the windows boot code. Without it grub would mount the partition 
and load a linux-style kernel (with a kernel= line).

-- 
Dan Armak
Gentoo Linux Developer, Desktop Team (KDE)
Matan, Israel