I have Maxtor 120GB S-ATA then few months ago i bought Seagate 320GB 7200.10 S-ATA. This Seagate has better performance, and more quiet than Maxtor, regarding to my ears.
Yesterday i've made a rubber bands by myself from old bicycle tire, that's very impressive on reducing the noise. I can still barely hear Maxtor on its work but not the Seagate. My case is open though.