21.8. Booting Another Operating System with GRUB

If your system has another operating system installed on a different hard disk or partition, you can configure GRUB so it can be chosen and started at boot time instead of Linux. If you want to boot FreeBSD, NetBSD, or OpenBSD, see Section 21.7 “Booting a New Linux Kernel or BSD with GRUB” instead—but for Windows, UNIXWare, or any other OS, follow these steps:

1.
On the module's main page, click on Add a new boot option to bring up the boot option creation form.

2.
Enter a unique name into the Option title field, such as windows.

3.
Set the Boot image partition field to Selected and choose the partition that contains the other OS from the list next to it. If the partition does not appear in the menu, you will need to choose Other instead and enter the disk and partition into the field next to it, in the hdX,Y format used by GRUB.

4.
Change the Operating system to boot to Other OS.

5.
Normally, GRUB will simply run the boot loader in the first sector of the chosen partition. There may not always be a boot loader there if, for example, the operating system normally writes its loader to the master boot record.

If the other operating system is Windows, select the From chainloader file and enter +1 into the field next to it. You must also check the Make root partition action? option.

If booting SCO UNIXWare, you need to also select the From chainloader file and enter – force +1 into the field next to it. The Make root partition action? option must also be selected.

6.
Click the Create button to have the new OS added. Your browser will return to the module's main page, which will now include an icon for your new boot option.

7.
To boot into the other operating system, restart your system and select it from the GRUB menu at boot time.

As with boot options for Linux kernels, you can edit or delete the option for another operating system by clicking on its icon on the module's main page. Any changes will take effect immediately, to be used when the system is next rebooted.

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