How do I chainload GRUB2 to another disk?

Then have GRUB2 installed on the partition instead of in the MBR itself so that GRUB2 is chainloaded. When Windows (or another MS DOS based boot loader) is installed on another disk, then regular chainloading in the grub.cfg may be sufficient to boot it.

When to use regular chainloading in grub.cfg?

Windows (MSDOS based boot loaders) When Windows (or another MS DOS based boot loader) is installed on another disk, then regular chainloading in the grub.cfg may be sufficient to boot it. However, if Windows is on the same disk on a different partition, or if regular chainloading doesn’t work, then read on.

Which is the boot loader for GRUB 2?

The GRand Unified Bootloader (GRUB)is actually two boot loaders. This page describes GRUB 2, which is the current version of the boot loader. The previous page, Using GRUB Legacy,describes the previous (and now discontinued) version of the boot loader.

When do you need to remap chainloading Gentoo bootloader?

The remapping may not be necessary if the system has a single boot disk. The mapping is necessary before chainloading TrueCrypt bootloader in the case that the boot disk (hd1 as shown in the example above) should appear as the primary boot device (hd0), otherwise TrueCrypt would fail to boot because the correct disk will not be found.

https://www.youtube.com/watch?v=LhhqiDjJNDo

How does GRUB2 automatically find root partitions?

GRUB2 is capable of automatically finding Windows partitions and assigning the root partitions. The Windows partition must first be mounted before the probe will be successful.

What’s the difference between GRUB Legacy and GRUB4DOS?

GRUB4DOS has an interface very similar to GRUB Legacy and a menu.lst entry which can be used to chainload the TrueCrypt bootloader or to boot a rescue CD (from an encrypted partition on the same disk).