02-27-2002
You have to do this via your BIOS. As your machine boots up, before it reaches GRUB, it should tell you which key to press to interrupt and access your BIOS / CMOS / setup.
It depends on each BIOS, but poke around a little. Make sure to to write down what you did in case you have to go back and undo it!
Look in where your do your drive setup... It may specify your geometry, or it may be set to "auto", or something similar. It should be in the drive settings screen, though.
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LEARN ABOUT CENTOS
grub2-install
GRUB-INSTALL(1) General Commands Manual GRUB-INSTALL(1)
NAME
grub-install -- Install GRUB on a device.
SYNOPSIS
grub-install [--modules=MODULES] [--install-modules=MODULES]
[--themes=THEMES] [--fonts=FONTS] [--locales=LOCALES]
[--compress[=no,xz,gz,lzo]] [-d | --directory=DIR]
[--grub-mkimage=FILE] [--boot-directory=DIR]
[--target=TARGET] [--grub-setup=FILE]
[--grub-mkrelpath=FILE] [--grub-probe=FILE]
[--allow-floppy] [--recheck] [--force] [--force-file-id]
[--disk-module=MODULE] [--no-nvram] [--removable]
[--bootloader-id=ID] [--efi-directory=DIR] INSTALL_DEVICE
DESCRIPTION
grub-install installs GRUB onto a device. This includes copying GRUB images into the target directory (generally /boot/grub), and on some
platforms may also include installing GRUB onto a boot sector.
OPTIONS
--modules=MODULES
Pre-load modules specified by MODULES.
--install-modules=MODULES
Install only MODULES and their dependencies. The default is to install all available modules.
--themes=THEMES
Install THEMES. The default is to install the starfield theme, if available.
--fonts=FONTS
Install FONTS. The default is to install the unicode font.
--locales=LOCALES
Install only locales listed in LOCALES. The default is to install all available locales.
--compress=no,xz,gz,lzo
Compress GRUB files using the specified compression algorithm.
--directory=DIR
Use images and modules in DIR.
--grub-mkimage=FILE
Use FILE as grub-mkimage. The default is /usr/bin/grub-mkimage.
--boot-directory=DIR
Use DIR as the boot directory. The default is /boot. GRUB will put its files in a subdirectory of this directory named grub.
--target=TARGET
Install GRUB for TARGET platform. The default is the platform grub-install is running on.
--grub-setup=FILE
Use FILE as grub-setup. The default is /usr/bin/grub-setup.
--grub-mkrelpath=FILE
Use FILE as grub-mkrelpath. The default is /usr/bin/grub-mkrelpath.
--grub-probe=FILE
Use FILE as grub-probe. The default is /usr/bin/grub-mkrelpath.
--allow-floppy
Make the device also bootable as a floppy. This option is the default for /dev/fdX devices. Some BIOSes will not boot images cre-
ated with this option.
--recheck
Delete any existing device map and create a new one if necessary.
--force
Install even if problems are detected.
--force-file-id
Use identifier file even if UUID is available.
--disk-module=MODULE
Use MODULE for disk access. This allows you to manually specify either biosdisk or native disk access. This option is only avail-
able on the BIOS target platform.
--no-nvram
Do not update the boot-device NVRAM variable. This option is only available on IEEE1275 target platforms.
--removable
Treat the target device as if it is removeable. This option is only available on the EFI target platform.
--bootloader-id=ID
Use ID as the bootloader ID. This opption is only available on the EFI target platform.
--efi-directory=DIR
Use DIR as the EFI System Partition root. This opption is only available on the EFI ta rget platform.
INSTALL_DEVICE
Install GRUB to the block device INSTALL_DEVICE.
SEE ALSO
info grub
Wed Feb 26 2014 GRUB-INSTALL(1)