How does GRUB detect operating systems

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So once stage 2 of grub has been loaded, how does it scan for OS's, I assume it will look at the VBR of every partition, but how does it know what OS the code in the VBR pertains to, there seem to be no clues on the VBR as to what OS is installed










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    So once stage 2 of grub has been loaded, how does it scan for OS's, I assume it will look at the VBR of every partition, but how does it know what OS the code in the VBR pertains to, there seem to be no clues on the VBR as to what OS is installed










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      So once stage 2 of grub has been loaded, how does it scan for OS's, I assume it will look at the VBR of every partition, but how does it know what OS the code in the VBR pertains to, there seem to be no clues on the VBR as to what OS is installed










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      So once stage 2 of grub has been loaded, how does it scan for OS's, I assume it will look at the VBR of every partition, but how does it know what OS the code in the VBR pertains to, there seem to be no clues on the VBR as to what OS is installed







      grub2






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