WD Caviar Green 2TB & Seagate Pipeline HD 500GB: Two Very Quiet Drives
 

Two drives vie for the title of Miss SPCR Quietest 3.5" Hard Drive 2009. WD's candidate is the first and only (so far) 2TB desktop drive, and happens to be part of their famous Green Power series. Seagate's contestant is a 500GB Pipeline HD, marketed for media applications and spinning at an odd 5900 RPM.

http://www.silentpcreview.com/wd-gre...pipeline-500gb