Does anyone know what this is HDAPM? Thanks
This is probably the only relevant thing.
I'm not sure why you'd want or need this, as ATA drives are long dead.
A Mac OS X utility for setting the power management (APM) level on ATA hard drives.
It can be used to eliminate "chirping" or "clicking when idle" noises in some HDDs.
Further information can be found in the usage guide.
New! (Aug 25, 2012) version 1.2.
Thanks for this information. I have a MM 2011 model and it started to make clicking noises 2 days ago. When I downloaded this the clicking now i hear maybe once or twice not like before loud through my computer speakers.