A variety of bootloaders rewrite the partition table in various ways, to accomplish "partition
hiding".

Various ways that partitions are hidden:

    - the filesystem type is modified       (by far the most common)

    - the partition table is extensively rewritten,  like I'm suggesting
                ==> this page suggests terminology of "hidden vs. cleared"
                    http://www.plop.at/en/bootmanager/hiddenpartitions.html




Programs which extensively rewrite the partition table
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Vista Hide-n-Seek
    http://neosmart.net/forums/showthread.php?t=1341