How to Install Parted Magic to hard drive

menuentry "Parted Magic" {
set root=(hd0,msdos1)
linux /pmagic/bzImage64 root=/dev/sda1 boot=pmagic edd=on vga=normal
initrd /pmagic/initrd.img /pmagic/fu.img /pmagic/m64.img
}

Ensure root is set to target partition (from GRUB2 pov).
hd0 = first disk (starting from 0).
msdos2 = 2 partition.
root=/dev/sda2 can then be set (again from GRUB2's pov).