GRUB Legacy and GRUB 2 are different versions of the GNU GRUB boot loader, which is used to load Linux and other operating systems. One of the differences between them is the naming convention for partitions. In GRUB Legacy, partition numbers start at 0, while in GRUB 2, they start at 1. For example, the first partition of the first hard disk would be (hd0,0) in GRUB Legacy and (hd0,1) in GRUB 2. This change was made to avoid confusion with the Linux device names, which start at 1, such as /dev/sda1. Another reason for this change was to make GRUB more consistent with other operating systems, such as Windows and BSD, which also start partition numbers at 1. References:
GNU GRUB Manual 2.06: Changes from GRUB Legacy
What are the differences between GRUB and GRUB2 Boot Loader
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