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geometry

geometry drive [cylinder head sector [total_sector]] Command
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.