Thomas, I did similar tests with hardy. I had the same results. But a fresh installation is working just fine. This happened only when I upgraded to Hardy. I wonder if it is related to libata bug 195221 (https://bugs.launchpad.net/ubuntu/+source/linux/+bug/195221) You can see Ravindran's comment (https://bugs.launchpad.net/ubuntu/+source/linux-source-2.6.22/+bug/131094/comments/760) It show udma2 being selected instead of udma4. Can others confirm this ?
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