grub-mkdevicemap
create GRUB device mapping file
TLDR
Generate device map
$ sudo grub-mkdevicemap
Specify output file$ sudo grub-mkdevicemap -m /boot/grub/device.map
Verbose output$ sudo grub-mkdevicemap -v
SYNOPSIS
grub-mkdevicemap [options]
DESCRIPTION
grub-mkdevicemap creates a device map file for GRUB that maps BIOS drive numbers to Linux device names. The device map helps GRUB understand disk ordering.The map is automatically generated but can be customized for special configurations where disk ordering needs to be explicitly controlled.
PARAMETERS
-m, --device-map FILE
Output device map file (default: /boot/grub/device.map).-n, --no-floppy
Skip floppy detection.-s, --probe-second-floppy
Also probe the second floppy drive.-v, --verbose
Verbose mode.-h, --help
Display help information.
INSTALL
sudo apt install grub-common
CAVEATS
Mostly unnecessary today since GRUB generates a device map on the fly and identifies disks by UUID or label in grub.cfg. Still useful to override detection, such as when a partition or logical volume is used as a virtual machine's disk.
HISTORY
grub-mkdevicemap was developed as part of GNU GRUB for device mapping between BIOS and Linux.
SEE ALSO
grub-install(8), grub-mkconfig(8), grub(8)
