Re: Grub Reinstall Problem!!!

From: Joe(theWordy)Philbrook (jtwdyp_at_ttlc.net)
Date: 06/01/04

  • Next message: Aly Dharshi: "Re: Mandrake SRPMs on Fedora Core 1" 
    To: fedora-list@redhat.com
Date: Tue, 1 Jun 2004 01:41:37 -0400

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    It would appear that on May 31, Peter Boy did say to Chiheb Djabri:

    > If you have lost your grub by a windows install, you lost your MBR (the
    > first boot sector on your harddisk). The content of your /boot partition
    > is still in place.
    >
    > To reinstall the mbr you have to perform
    > grub-install /dev/hda
    >
    > You should boot from the first Fedora CD in rescue mode, the program
    > will found your Linux installation and mount it. It will give you some
    > information how to make your installed root partition to your new root
    > (chroot command). Check, that the /boot partition is mounted, too.

    Hmmmn interesting... I too am new to grub (much more used to lilo) And
    so since I hadn't yet found the time to learn this I was pleased to see
    this info...

    I have a couple of questions though.

    With lilo, if I install it to mbr with "lilo -b /dev/hda" I can also make
    a back up boot floppy with "lilo -b /dev/fd0" without breaking the one
    in /dev/hda... That is, I normally would get my lilo boot from the mbr of
    /dev/hda. But if something trashes the mbr All I have to do is pop in the
    lilo boot floppy and I can still boot any of my {undamaged} linux, and
    probably my win98 & DrDos. I wouldn't need to fuss with the rescue mode
    at all. I just rerun "lilo -b /dev/hda" And I'm done. (though I may have
    had to "sys" the windows or DrDos partitions to make them bootable again
    first...)

    With grub, if I make a working boot floppy with "grub-install /dev/fd0"
    then the one I had in /dev/hda is broken (infinte loop of the word grub
    being printed to the screen) If I boot from the floppy and do a
    "grub-install /dev/hda" The mbr can boot again, but now the grub floppy
    boot is broke...

    1) is it possible to install the same grub to start from the mbr OR from
    a floppy depending on which bios finds first?

    2) In case I must depend on the rescue mode sometime, Will it be able to
    find the right linux installation on a system with
    FC2, FC1, MDK9.1, SuSE 7.3, Win98se, AND Dr Dos on it. Or would the
    following partition tables confuse it

    - --
    | ? ?
    |
    | -=- -=- I'm NOT clueless...
    | <?> <?> But I just don't know.
    | ^ Joe (theWordy) Philbrook
    | --- J(tWdy)P
    | <jtwdyp@ttlc.net>
    | ? ?

    [root@localhost jtwdyp]# fdisk -l /dev/hda /dev/hdc

    Disk /dev/hda: 40.0 GB, 40020664320 bytes
    255 heads, 63 sectors/track, 4865 cylinders
    Units = cylinders of 16065 * 512 = 8225280 bytes

       Device Boot Start End Blocks Id System
    /dev/hda1 * 1 638 5124703+ c W95 FAT32 (LBA)
    /dev/hda2 639 1217 4650817+ f W95 Ext'd (LBA)
    /dev/hda3 1218 3162 15623212+ 83 Linux
    /dev/hda4 3163 4865 13679347+ 83 Linux
    /dev/hda5 639 1021 3076416 b W95 FAT32
    /dev/hda6 1022 1148 1020096 83 Linux
    /dev/hda7 1149 1217 554211 82 Linux swap

    Disk /dev/hdc: 61.4 GB, 61492838400 bytes
    255 heads, 63 sectors/track, 7476 cylinders
    Units = cylinders of 16065 * 512 = 8225280 bytes

       Device Boot Start End Blocks Id System
    /dev/hdc1 * 1 261 2096451 6 FAT16
    /dev/hdc2 262 3586 26708062+ 5 Extended
    /dev/hdc3 3587 5531 15623212+ 83 Linux
    /dev/hdc4 5532 7476 15623212+ 83 Linux
    /dev/hdc5 262 366 843381 83 Linux
    /dev/hdc6 367 427 489951 83 Linux
    /dev/hdc7 428 792 2931831 83 Linux
    /dev/hdc8 793 1400 4883728+ 83 Linux
    /dev/hdc9 1401 1522 979933+ 83 Linux
    /dev/hdc10 1523 3470 15647278+ 83 Linux
    /dev/hdc11 3471 3586 931738+ 82 Linux swap
    [root@localhost jtwdyp]#

       ##############################################################
       # You can find my public gpg key at http://pgpkeys.mit.edu/ #
       ##############################################################

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