|It means that something horrible has gone wrong with you hard disk.|
The partition table is part of the MBR and is normally located right at the beginning of the hard disk on sector one, track zero where the BIOS knows where to find it.
The is only one partition table for each physical disk, regardless of how many partitions the disk may contain.
To have a partition table at either sector 16605 or cluster 16605 means that something has gone terribly wrong.
I would recover what ever data I could from the hard disk, then delete all partitions and reformat from scratch.