GRUB 2 installation : BIOS order impacted ?
I have a laptop dedicated to test Linux distros.
I often test Live CD on it. Boot order is correct : first CD, second hard disk.
Few days ago I installed latest distro CrunchBang# with GRUB2 on hard disk.
But since I noticed that I'm not able anymore to boot from CD ?!?
I definitely cannot image GRUB 2 changing the BIOS order, correct ?!?
I tried to press...press...press... the F2 key (as quickly display when power on) to enter BIOS setup but with no success at all : the laptop continue to boot via hard disk with GRUB 2, or it freezes on F2 until next key proceed again ... with GRUB 2.
Next step, I replaced the hard disk with a new one.
As there is no MBR or whatever boot on this brand new disk, then it I was again able to boot from CD.
From there I installed latest Debian Squeeze still with GRUB2 on the hard disk ... and I got same problem now. I'm never able to grab F2 to access BIOS setup.
Now my question is :
how can I completely remove the MBR boot master on the hard disk to try to force booting from CD ? (I do not care to lost all data on this disk : it's only a testing laptop).
Is the following command dd correct to completely wipe hard disk and remove MBR ?
(I repeat : I'm OK to lost all on this disk)
dd if=/dev/null of=/dev/XXX bs=446 count=1 where "XXX" is the id of your drive--eg hda, hdd, sda (note no partition id---just drive)
Doing this I would like to be able to enter the BIOS setup once the laptop cannot boot and check boot order, but also BIOS verbosity ..etc...