PureDisk fails to boot, reporting "Error 21: Selected disk does not exist"

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  • Article ID:000085791


PureDisk fails to boot, reporting "Error 21: Selected disk does not exist"

Error Message

GNU GRUB version 0.97 (623 lower….)

booting 'PDLinux 6.6.3'
root (hd2,0)

Error 21: Selected disk does not exist"

Press any key to continue


Updating the kernel resulted in the /boot/grub/menu.lst root(hd0,0) changing to root(hd2,0).

###Don't change this comment - YaST2 identifier: Original name: linux###
title PDLinux 6.6.3
    root (hd2,0)


  1. Console access via person at the server, or via KVM switch,etc., will be required.
  2. Boot from system, go to the grub menu and edit the grub menu option to boot the operating system (usually by pressing “e”). The “root(hdX,Z)” type of command needs to be changed to “root(hdY,Z)”, where hdY is the new BIOS device name for the root/boot disk. Example, edit "root(hd2,0)" to "root(hd0,0)". After editing, the system can be booted by pressing “b”. The system will then boot successfully.
  3. At the first boot, the admin should edit the /boot/grub/menu.lst file to change all references of “hdX” to “hdY” so as to point to the correct BIOS device name. This will ensure the system boots correctly thereafter.


Applies To

Boot problem after upgrading to PDLinux 6.6.1. or 6.6.3


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