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Port Multiplier

Port Multiplier (PM) has two different structures, one is called Command-based switching and the other is called FIS-based switching. Here is a link of a diagram:

To see multiple individual HDDs simultaneously, you need to look for "Port Multiplier with FIS-based switching". Command-based switching only allows you to toggle between HDDs.

As far I know Intel's ICH9R and ICH10R both don't support FIS-based switching PM.