#100 Partition table is bad
The master boot record (MBR) can contain, at most, one extended partition, and
each extended partition boot record (EPBR) can contain, at most, one link to
another EPBR. This error occurs when a partition table violates the foregoing
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rule. It can also occur if you have more than one active partition. Since any
modifications PartitionMagic makes may decrease the amount of data that is
recoverable from the hard disk, PartitionMagic does not recognize any of the hard
disk’s partitions. If you must create new, error-free partition tables to resolve
your problem, see “Resolving Partition Table Errors” on page 126 for
instructions.