Found this on wikipedia.
"AAM is no longer available for Seagate and Western Digital drives. In 2008, Seagate issued a statement announcing it was removing AAM capabilities from all its drives because Convolve alleged that one of its patents, US Patent No. 6,314,473, covers AAM technology. Western Digital began doing the same in 2011, without making any official announcements, nor updating their product documentation. The product specification sheets continue to claim (in March 2012) that there are different seek modes on their drives. However the hardware that is now manufactured does not allow control over AAM (for instance, the premium 1 TB Caviar Black (WD1002FAEX, SATA600, 3.5", 7200 RPM, 64 MB cache does not allow AAM to be enabled)."
http://en.wikipedia.org/wiki/Automatic_acoustic_management
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