Update The Transmission problem may have been caused by my WD HDD. Apparently WD screwed up the firmware. Some of the symptoms seem similar to my problem.
Here are some links about the WD problem: WD Caviar Green HDDs Suffer from a Critical Design Flaw http://news.softpedia.com/news/WD-Caviar-Green-HDDs-Suffer-From-a-Critical-Design-Flaw-196159.shtml Critical Design Flaw Found in WD Caviar Green HDDs http://www.ngohq.com/news/19805-critical-design-flaw-found-in-wd-caviar-green-hdds.html This problem could be responsible for this (compare with my previous post): WD 1.5 TB internal HDD (NTFS format) - rated 71% due to Spinup time. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/701753 Title: Internal HDD thrashing when using Transmission -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
