Dual-Boot with separate harddrives, is this correct?

[adversity]

I want to make sure I'm doing this right, or if it's the best way to do it. I have my computer set up as follows:

1x 250GB HDD for Windows 7 (100GB C:\, 130GB "Home" for My Docs and Backups)

2x 320GB HDDs for Gentoo (/boot, / , swap, LVM2 for /home /opt /var etc. & RAID)

Now, when I installed Win7 it was the only drive in the computer as Windows kept giving me problems with it not being the first boot device or not being the first partition on a drive. So after Windows was installed I put the other two drives in but left the Windows drive as the first boot device. Got everything set up the way I wanted it and now I'm getting ready to setup Gentoo the way I want.

What I want to know is, do I HAVE to leave the Windows drive as the first boot device, then install GRUB to MBR of that disk? Or can I now move the Windows drive to the bottom of the boot list, install GRUB to the 2 Gentoo drives, and be on my way? I was planning on using GRUB2 since it handles auto-detection fairly well. But from what I've seen if I were to use legacy GRUB, it would require adding 1 or 2 lines that say:

mapdrive (hd0) (hd1)

or something along those lines? I wasn't sure if it was different since I'm using 3x HDDs, although the 2 Gentoo drives will be in a RAID array (RAID1 for boot and RAID0 for everything else).

Any help would be greatly appreciated.

[Aquous]

You can put Windows as the second drive and make it think it's primary by using these grub commands:

[NeddySeagoon]

adversity,

I would leave Windows alone where it it and set up your BIOS to load grub from one of your Gentoo drives, then have grub chainload Windows.
The means you leave the Windows bootloader and MBR intact, which is a verygoodthing.

As Aquous points out, you may need to fool windows into believing its on the first drive, even if it no longer appears to be.
Those two map commands actually swap hd0 and hd1 in the BIOS detection order before grub exits.
They do not affect any following grub commands.
_________________
Regards,

NeddySeagoon

Computer users fall into two groups:-
those that do backups
those that have never had a hard drive fail.

[mp342]