[LAU] Slightly OT: Re-Installing GRUB

Ray Rashif schivmeister at gmail.com
Sat Jun 14 13:08:57 EDT 2008

You wrote to nowhere with the following:

grub-install /dev/sda0

sda0 does not exist. Numbering starts from 1 for Linux device nodes, unlike
the bootloader. To not specify a number can mean various things to various
programs. For disk utilities, it denotes the entire disk regardless of
partitions. For GRUB, it means MBR. Thus:

grub-install /dev/sda

To inject the MBR. Some complex multi-boot setups may need:

grub-install /dev/sdaN

to inject /boot to /dev/sdaN where N is a partition number from 1 onwards,
but I personally favour just one unified bootloader on one disk (MBR).
Whichever disk has the first boot priority will be hd0 to GRUB. For Windows
the standard lines are:

title Windows
rootnoverify (hd0,0)
chainloader +1

Which denotes Windows resident on the first boot device, first partition.
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