Writing a new masterboot block

To change the disk geometry defined on the masterboot block of the root disk:

1. Put the system in single-user maintenance mode.

2. Enter the following command to write a new masterboot block to the root disk:
   
   /bin/dparam -w /dev/rhd00

3. Overwrite the root disk geometry information in the masterboot block with the values expected by the device driver:
   
   /bin/dparam /dev/rhd00 `/bin/dparam /dev/rhd00`

4. Reboot the system using the command:
   
   /etc/reboot