Re: How do I make a boot disk so I can restore Grub?
ANTant_at_zimage.com
Date: 01/25/05
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Date: Tue, 25 Jan 2005 06:10:43 -0600
> > Hello. I need to install Windows 2000 SP4 on a second IDE HDD (hdb).
> One of my favorite sayings (inspired by Python): "You don't *need*
> windoze."
I need it for games, softwares, and drivers that do not work in Linux. :(
Basically, I want to dual boot.
> > Debian (Kernel v2.6.8) and its Grub is already installed on the first
> > HDD (hda). I read that Windows will overwrite the MBR.
> Yes it does. Billy Gates likes to assume that there is no operating system
> in the universe other than his piece of crap.
> I was told that I
> > need to make a boot disk so I can restore MBR after Windows
> > installation. How do I make a boot disk and be able to restore Grub on
> > MBR. I hope I am saying this right since it is a bit technical for me.
> >
> Looking at what you wrote below, you seem to be off track a bit. Since you
> already said you are using Grub (which is excellent), you should not be
> talking about lilo at all. Lilo and Grub are two different bootloaders,
> and all that lilo stuff is irrelevant to Grub. I prefer Grub and feel that
> you should stick with it.
Ahh. OK.
> The documentation in the Grub info (not man) documentation explains
> everything very well. Read it thoroughly before messing with any of this,
> because you may very well find yourself manually issuing commands to Grub
> to get back on line after you infect your system with windoze. Pay close
> attention to the parts about chainloading.
Yikes, that sounds scary.
> The command for making a Grub boot floppy is simply "setup (fd0)" assuming
> fd0 is your floppy drive and you are in grub and have already told grub
> where your boot partition is. You should be running grub in standalone
> mode (booting from it rather than launching it from the linux command
> line) when you do this.
Are you talking about the blue Grub text menu where it shows two Kernel
2.6.8 options to boot?
> One very cool trick (documented in the latest
> version of Grub) is to set up a menu option to make boot disks from the
> Grub boot-up screen. Below is my /boot/grub/menu.lst file. It allows me to
> select from two different linux kernels or to setup a boot floppy. The
> entry that makes the boot floppy is entry number 2. Also note entry number
> 1, which installs the grub bootloader onto my "first" hard drive. This is
> EXACTLY what you need except that you need to replace the "hd0,0" part
> with the designation for wherever your boot partition is. This entry
> number 1 is there for precisely the situation where the MBR gets clobbered
> (which really isn't likely for me since my computer is not infested with
> windoze). If I try to boot and see that my MBR is clobbered, I simply
> ctl-alt-delete to start over and select this entry to restore the MBR. No
> need to hunt for documentation or anything!i
Interesting and kind of confusing. Maybe I should paste my grub
configuration. It's 4am and I need to go to bed. Should I get you that
information? :)
> I have a separate partition for /boot. If your /boot directory is
> actually on your root partition, and if your root partition is the first
> one on the drive, then I *think* this becomes "root (hd0,0)/boot" But,
> like I said, read the documentation really well before you mess with this.
Yes, I don't think I have /boot. I did not set up the partitions manually. I
let Debian's installer (Sarge) do that.
> (In my case, my boot partition is the first one on the drive, and the root
> partition is the second one.)
> Here is my Grub setup file (/boot/grub/menu.lst):
> # This is the Grub (Grand Unified BootLoader) configuration file.
> # See info grub for documentation.
> # Thomas D. Shepard, 28 August 2004
> # By default, boot this entry (counting from 0).
> default 0
> # Boot automatically after this many seconds.
> timeout 10
> # This is entry number 0.
> # Boots kernel in file lfskernel in top directory of first partition
> # in first hard drive.
> # (hd0) means first hard drive. (hd0,0) means the first partition.
> # The kernel is passed the command-line arguments "ro root=/dev/hda2"
> # Which means to mount /dev/hda2 (the second partition of the first hard
> # drive) read-only as the root partition.
> #
> title Boot Linux from the first hard drive
> root (hd0,0)
> kernel /lfskernel ro root=/dev/hda2
> # This is entry number 1. It installs or re-installs Grub onto the boot
> # sector of the first hard drive.
> #
> title Install Grub onto the MBR of the first hard drive (experts only)
> root (hd0,0)
> setup (hd0)
> # This is entry number 2. It makes a Grub boot floppy.
> #
> title Make boot floppy (insert blank floppy first)
> root (hd0,0)
> setup (fd0)
> # This is entry number 3. It boots vmlinuz-2.6.10.
> #
> title Boot Linux 2.6 from the first hard drive
> root (hd0,0)
> kernel /vmlinuz-2.6.10 ro root=/dev/hda2
> >
> > mkboot and lilo didn't work for me:
> > # mkboot
> >
> [...]
Thanks.
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