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On Sun, 02 Jan 2005 11:26:04 -0500 ewh5243 at netscape.net wrote: > >On Sun, 2 Jan 2005 00:02:02 -0500 > >Bill Horne <bill at billhorne.homelinux.org> wrote: > > >> Well, I started the New Year off with a bang: I fat-fingered a dd > >> command and I've overwritten the first 512 bytes of my mbr. > >> > >> Before I dig out the backups, please tell me if it's possible to > >> recreate the MBR from the information in the existing partition > >> labels, or if there's a backup of the partition table that I > >> can use. > > On Sun Jan 2 08:15:32 EST 2005 Jerry Feldman said: > > > You can have GRUB or LILO rebuild your MBR. > > Boot a rescue CD, a standalone Linux, or boot your installed > > system from CD or floppy. > > If you are using GRUB: > > If you are booting from a rescue: > > mount your root file system and chroot it. > > mount your /boot if separate. > > Execute the grub shell. Here is an excerpt from the GRUB docs. > > > > Once started, GRUB will show the command-line interface (*note > > Command-line interface::). First, set the GRUB's "root device"(1) > > (*note Installing GRUB natively-Footnote-1::) to the boot > > directory, like this: > > > > grub> root (hd0,0) > > [snip] > > Jerry, > > Thanks for the tip: I tried to start GRUB from floppy, but when I enter > the "root" command, I get an error saying either that the partition > doesn't exist or that the cylinder number is higher than the bios limit, > depending on which partition I try. > > Does GRUB have a way to rebuild the partition table? No. Stop right there. At this point, you should boot a standalone Linux. Knoppix is excellent. Then use QTParted. If you do not have Knoppix, but can boot into a rescue, run fdisk, and see if it recognizes the partition table. Note that you can easily rebuild the partition table if you know the exact dimensions of the old partition table. -- Jerry Feldman <gaf at blu.org> Boston Linux and Unix user group http://www.blu.org PGP key id:C5061EA9 PGP Key fingerprint:053C 73EC 3AC1 5C44 3E14 9245 FB00 3ED5 C506 1EA9 -------------- next part -------------- A non-text attachment was scrubbed... Name: not available Type: application/pgp-signature Size: 189 bytes Desc: not available URL: <http://lists.blu.org/pipermail/discuss/attachments/20050102/bad0ee30/attachment.sig>
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