Vista - Hypothetical triple boot XP, Vista ,OS 10.5.1

Hi all
If I was going to ask for any help in here regarding above hypothetical subject, would I be breaking forum rules?
Hypothetically I have dual boot machine, XP and Vista on two separate SATA II hard drives. I am, hypothetically speaking, going to slot in 3rd 500Gb hard drive to install Mac OS 10.5.1. So far, hypothetically speaking, I managed to find instructions on how to install Kalyway on separate partition on the same hard drive but nothing on separate hard drive.
I am being paranoid of destroying boot loader, but I can not tell for certain which boot loader I am using when booting into Vista and which boot loader when booting into XP or they are two totally different ones. Basically when I turn my machine on, after a few seconds I get promoted to choose which OS I want to go to. That's what I want to get if I was, hypothetically speaking, going to install Mac OS 10.5.1.
Any help would be appreciated

While I haven't actually tried it with that (hypothetical) configuration, it sounds like a job for GRUB.

I am reading about GRUB but I don't understand it.....
Are you able to share some light on what I am suppose to do

I've never used it without a linux installation, which makes it tricky. There is a guide HERE if you want to know more. If the instructions spook you, it's not a solution for you I think. There's probably other easier dedicated bootloaders that would do the job out there too, just that grub came to mind because it's free and readily available.

Thank you
What do you think about EasyBCD? I am not sure if, hypothetically speaking, Kalyway 10.5.1 OS will destroy anything, as in corrupt it.

If you get in trouble, restoring the bootloader for vista is easily done. Just run a repair off the vista installation media. I wouldn't trust BCD to run anything but vista though, MS isn't known to play well with other OSes.

That is one way, It looks like GRUB is easy to use but how do you install it....

I would definately suggest you take a look at EasyBCD as it shows a lot of hypothetical setups in the documentation and has specific options for MAC os.

btw I have had problems with Grub and vista in dual boot situations. none at all with easyBCD.

Another option of course in your situation with three HDD with an os on each is to use the Bios Disk Boot option just switch the option on in the bios and select the correct drive to boot from when you boot, and no messy multi boot loaders .

Bios Disk Boot option is another one I heard about it... I am going to look through my motherboard manual. If you know where to find it please show/ direct me there. I have MSI P35 Neo 2

not sure about specific mobo but is normally in boot options page of bios with and entry something like "show boot menu on startup" check your manual if you have it or try MSI website. the option may not be available but I would be suprised on a recent board.