What is the impact of removing an entry of HD(1,800,4000000,.....) from the file /boot/efi/EFI/redhat/grub.conf in Red Hat Enterprise Linux 6?

Solution Unverified - Updated -

Issue

  • What will be the impact on the system if one modifies the entry below
device (hd0) HD(1,800,400000,here-was-UUID)

to

device (hd0) 
  • what is the function of the HD(...) statement and what will be the impact of this corruption?

Environment

  • Red Hat Enterprise Linux 6.9
  • UEFI boot grub.conf

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