Does OSX turn off Hot-File-Adaptive-Clustering on SSDs? Or is it off on new OSs?

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http://forums.anandtech.com – Just vaguely curious. This was a method they used to make hard drives suck less, but it obviously does not make sense for solid state drives. I'm curious if they intelligently turn it off on SSDs, or if it's just off completely on new OSs and they let hard drive performance regress in favor of SSDs. (Hardware)