GNU Info

(grub.info)geometry

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geometry
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 - Command: geometry drive [cylinder head sector [total_sector]]
     Print the information for the drive DRIVE. In the grub shell, you
     can set the geometry of the drive arbitrarily. The number of the
     cylinders, the one of the heads, the one of the sectors and the
     one of the total sectors are set to CYLINDER, HEAD, SECTOR and
     TOTAL_SECTOR, respectively. If you omit TOTAL_SECTOR, then it will
     be calculated based on the C/H/S values automatically.