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[Tom <question78237@xxxxxxxxxxxxxxxxxxxxx>]

Question #78237 on Ubuntu changed:
https://answers.launchpad.net/ubuntu/+question/78237

Tom proposed the following answer:
The grub boot-loader stands for "GRand Unified Boot-loader". It's not
really linux as it is designed to be better at talking more directly
with the machine.  That's why it starts counting at 0.  When it says
(hd0) it means sda.  (hd1) would be sdb but it's only talking about
which Master Boot Record to make point to the main part of grub.

During bootup it starts with a splash-screen about the mbord and then
looks quickly at drives plugged in and then boots into the bios stage
which does it's own much more advanced hardware detections.  The bios
then looks up the MBR of the first hard-drive which tells it where to
find the boot-loader (Lilo & Grub are the 2 boot-loaders most often used
by linux).  Then control is passed on to the boot-loader which loads in
the kernel of the OS and then passes control of the machine to the OS.
Then the OS does it's own hardware detection but tends to cheat a bit by
looking up what the bios found ;)

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