mine has been making the high pitched whining noise for a long time now. I put them inside these SmartDrive 2002 enclosures to keep them quiet. The enclosures feel pretty warm->hot usually. dunno what the temps are for sure but I am not taking them out because the sound is unbearable.
This eclosure is impressive though, that its able to dissapate so much heat, but this summer we'll see once and for all if the drive will last.
I cant really sell them, because of the noise. If they die, I am gonna have to look for a good deal on some seagates.