Therefore, a boot manager is a must for any similar situation.

Without a boot manager, the boot sequence chooses the same OS over and over again and boots to it. For instance, one may want to have Windows, a few Linux distributions and even a Mac OS X deployed on the same system.

So, we should have: centos #~> cat /etc/grub.Grub2Win provides you with a boot manager that allows you to boot from various operating systems every single time you power your computer on.įirst things first, boot managers resolve the problem that many users interfere with whenever they want to install different OSes on their PC. On the beginning of 11_linux and paste that section into it. Now, create the file: touch /etc/grub.d/11_linuxĪs this is script, remember to do: chmod +x /etc/grub.d/11_linux I normally write grub.cfg manually and never use update-grub and have a so called master Grub2 bootloader where i choose from where to boot from, then i let each linux distro to install its own bootloader on its own root partition, so linux can edit its own bootloader without touching my master grub2 bootloader.Īnd for jumping to other disk MBR i have this kind of entries on grub.cfg for normal OS that do not need to see the disk as if it where the first disk: menuentry 'Boot from second disk' In this particular example (I changed boot order at BIOS) case: dev/sdb1:Windows 7 (loader):Windows:chain Or not?)Īdding upon request output of os-prober for a sample machine with this configuration: sudo os-prober (The fact is: I think this question can be asked without specifying which one is the operating system in the 2nd hard disk. How can I add an entry to GRUB2 that boots to the second hard disk?

If I enter the BIOS on boot time and change boot order to Hard Disk 2, the second operating system boots OK. Issuing update-grub does not detect the operating system on the 2nd hard disk, but I know there is one. GRUB2 only boots to Ubuntu (on 1st hard disk, in my example). Hard Disk 2: Any other operating system (does it bother which one?) with some other MBR loader.Hard Disk 1: Ubuntu Linux with GRUB2 on MBR.I have researched for this question, but have not been able to find a clear answer.

Grub2Win 2.3.7.3 instal the new