You mean replace the boot drive? Or add a new drive that will also be bootable? A new data-only drive that does not boot doesn't need any grub adjustment.
If you have a bootable drive already, and you want to be able to boot an OS on a new drive, I believe you would run "grub-setup (hdx,y)" where x is the number of the drive counting from 0 (so if this is your second hd, it would be 1) and y is the partition number starting from 1 (first partition on the disk would be 1).
Some info, but they made one mistake and said that partitions count from 0. Partitions actually count from 1
http://diliman-networks.com/?page_id=21
Info is pretty rare and scattered at this point, if you are trying to do something else, or need more help, post here again, or ask on IRC (try ChatZilla for Firefox if you aren't familiar with IRC) irc://irc.freenode.net/#grub




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