Which device did I boot from?

[Dallas Clement]

Can anyone tell me how to determine which device Linux booted from.  I
am using GRUB to boot Linux.  My menu.lst config is this:

title           GNU/Linux, kernel 2.6.21.1
root            (hd0,0)
kernel          /boot/kernels/bzImage

Once booted from Linux, I would like to be able to tell which Linux
device, i.e. /dev/hdx or /dev/sdx corresponds to hd0.

Is there a way to determine this?

Thanks!