GNU Info

(grub.info)device

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Enter node , (file) or (file)node

device
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 - Command: device drive file
     In the grub shell, specify the file FILE as the actual drive for a
     BIOS drive DRIVE. You can use this command to create a disk image,
     and/or to fix the drives guessed by GRUB when GRUB fails to
     determine them correctly, like this:

          grub> device (fd0) /floppy-image
          grub> device (hd0) /dev/sd0

     This command can be used only in the grub shell (Note: Invoking
     the grub shell).