You need to attach the dmesg output using the web interface (do no paste into comment).
Also, retest latest kernel (2.6.20-12).
** Changed in: linux-source-2.6.20 (Ubuntu)
Assignee: (unassigned) => Ben Collins
Status: Confirmed => Needs Info
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hdparm gives low throughput on Intel SATA systems
https://launchpad.net/bugs/80829
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