[all variants] Slow eSATA on My Book Studio Edition II

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http://ubuntuforums.org – Hi. I just bought My Book Studio Edition II 2tb with eSATA being one of the decisive features, only to find it being even slower than USB 2.0. I use the external disc in a RAID 1 configuration (done via supplied software on a windows machine, the partition is therefore ntfs). I am very disappointed because of this, because if I can't get it to work properly, I just wasted somewhere around 50€, which is a substantial amount in this purchase. On top of that, I'd really need the added performance for video editing. I use Kubuntu and am backing up my files with Grsync. My laptop is HP dv5t series. Can anyone suggest what to do? (Hardware)