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A Rigid Disk Block (RDB) contains all the information needed to mount and
boot partition(s) on a hard drive. They contain vital information such as
how many logical heads and cylinders your drive is divided into, and the
start and end cylinders of all your partitions.
Although it is possible to change RDB's without damaging your partitioning
information, it is a risky operation that you do "at your own risk."
Changing a partition from being bootable to non-bootable won't usually
damage the information on the partitions, while changing the starting and
ending cylinders of a partition always will.