[ubuntu] ESATA transfer rates differ between windows and lucid

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http://ubuntuforums.org – Hi, I have a Dell Vostro 1720 laptop with a Sunix ECSA24 ExpressCard 2 port ESATA adapter. I have noticed that the transfer rates on Windows 7 to a blank hard disk is close to 80MB/s (sustained) whereas the same copy job maxes out at 50MB/s on Ubuntu - Karmic or Lucid. Anyone can think of why? More details needed? The adapter uses a Silicon Image 3132 (Si3132) Chipset. Thanks! (Hardware)