I'm running Ubuntu 12.04 64bit and I have an external USB 3.0 docking station. The docking station is made by Plugable and it has an ASMedia chipset (http://plugable.com/products/usb3-sata-u3).
In Ubuntu, when I want to remove a disk that I've connected via the docking station, I right click the disk and select "Safely Remove". The disk temporarily disappears from Ubuntu and I can hear it spin down in the docking station. However, after about three seconds I hear the disk spin back up and it reappears in Ubuntu (it reconnects). I end up having to simply power off the docking station without safely removing the disk from Ubuntu, which I would prefer not to do. I've tried different disks of various sizes from 3TB to 250GB but the result is the same. I've also tried a second docking station of the same model but the result is also the same. I have an external hard drive from Iomega that does not have this problem. However, the Iomega external hard drive is USB 2.0.
Has anyone encountered this type of problem before?