I'm not sure why you were getting those errors, but definitely stop the udisks service. Your blktrace shows it being accessed by the "pool" task. For some silly reason, the glib thread pool library that udisks uses decides to rename its threads to "pool" instead of the application name.
With udisks shut down, use hdparm -y to put the drive into suspend, then try checking its status with hdparm -C. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1733068 Title: Unmounted USB drives wake up on 16.04 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+bug/1733068/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
