WD, Seagate, HGST, Toshiba noise level comparison The Quietest 1TB drive= Western Digital AV-GP 1TB (Noise level 28.2 dB(A)) The Quietest 2TB drive= Toshiba E300 (Noise level 28.2 dB(A)) The Quietest 3TB drive= Western Digital Red (Noise level 28.8 dB(A)) The Quietest 4TB drive=Western