I have been progressing this issue, as it's driving me nuts. I know its not fundamental to the workings of the mb, and its driving me nuts cos when im using mb in a quiet room everytime i take my hand off the plam rest its apparent.
so...
i started trying things out,
Insulating tape round the little pegs that sit the drive in the chassis i only did the inside 2 where you can clamp the drive with the screw - same
Post it notes under the drive, 21 to be precise, maybe a minor difference, 21 post its were required to actually fill the cavity under the drive, which makes me think yes its the area and yes its the drive but no its not the pressure on the drive when your hand is resting on the area as the drive is effectivly "floating" on the 4 pins.
so i tried the post its on top of the drive, you can notice a difference but still hear the difference when you rest your palm on it.
I'm also not particularly fond of having tape and post it notes stuffed inside especially with the minimal effect they had. so all has been removed, and now the central heating has turned on i cant notice it any way
sure ssd is what i want and probably the way forward anyway, but im skint having just got the mb itself.