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In my laptop, Windows and ubuntu were installed one after another on different partitions of the hard drive. When I installed Ubuntu, I installed GRUB as the boot loader. So are the boot loaders for both Ubuntu and Windows GRUB?
– Tim
Commented Jan 26, 2014 at 2:50
No, you primaryly have GRUB. GRUB reads windows's and ubuntu's VBR. Then it loads the selected VBR as secondary boot loader.
– Hasan Manzak
Commented Jan 26, 2014 at 2:53
Thanks! Is my following understanding correct? (1) Each OS has its own boot loader. The one for ubuntu is GRUB, and what is the boot loader for Windows 7? (2) The first stage of GRUB is installed in the MBR of the drive, so GRUB is the primary boot loader, and the boot loader of Windows 7 is the secondary boot loader. The second stage of GRUB is stored in the VBR of the Ubuntu partition, and the boot loader (including both its first and second stages) of Windows 7 is stored in the VBR of the Windows partition.
– Tim
Commented Jan 26, 2014 at 3:51
(4) When booting Ubuntu, the first stage of GRUB in the MBR will load the second stage of GRUB in the VBR of Ubuntu partition. When booting Windows, the first stage of GRUB in the MBR will load the first stage of the boot loader of Windows stored in the VBR of the Windows partition, which in turned loads the second stage of the boot loader of Windows stored in the same VBR?
– Tim
Commented Jan 26, 2014 at 3:51

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