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[Fenyvesi Attila <792085@xxxxxxxxxxxxxxxxxx>]

I found two workarounds.

Workaround 1)
On Xubuntu 14.10 using Thunar 1.6.3 file manager I managed to stop the automatic remount of unmounted USB 3.0 drives using USB 3.0 ports.
In Thunar: Edit -> Preferences -> Advanced -> "Configure the management of removable drives and media." -> "Storage" tab:
I unchecked the "Mount removable drives when hot-plugged" option.
With this setting, after unmounting the USB 3.0 device in Thunar, 'dmesg | grep USB' has these new lines:
[ 1902.911399] usb 4-3: USB disconnect, device number 7
[ 1903.395819] usb 4-3: new SuperSpeed USB device number 8 using xhci_hcd
[ 1903.412365] usb 4-3: New USB device found, idVendor=174c, idProduct=55aa
[ 1903.412379] usb 4-3: New USB device strings: Mfr=2, Product=3, SerialNumber=1
[ 1903.413049] usb-storage 4-3:1.0: USB Mass Storage device detected
The USB 3.0 external HDD stops for a second and starts spinning after that (like before unchecking the mentioned preference), the device can be seen in /dev/ but is not mounted. As a side-effect of this, thunar doesn't automount drives plugged in.

Workaround 2)
Instead of using the eject buttons, right-click -> "Unmount" each partition of the device in the file manager (I tested this with Thunar). 

Screenshots available at
https://www.dropbox.com/sh/iax2x6by866nbtq/AADd3ljfdAn2ljqkZrJg0Spda?dl=0

** Attachment added: "two workarounds"
   https://bugs.launchpad.net/ubuntu/+source/nautilus/+bug/792085/+attachment/4268303/+files/Thunar_uncheck_setting.png

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https://bugs.launchpad.net/bugs/792085

Title:
  Automatic remount of safely removed drive

Status in “nautilus” package in Ubuntu:
  Confirmed
Status in “udev” package in Ubuntu:
  Confirmed

Bug description:
  Binary package hint: nautilus

  When I choose "Safely remove drive" context menu entry for an external
  USB drive within a nautilus window or directly clicking on the desktop
  icon, after about 10 seconds the drive is automatically remounted and
  a Nautilus window showing the root folder opens.

  I have noticed that similar already happened with a very old Ubuntu
  version - Bug #110589 and as that is so long time ago I thought it is
  better to open a new bug. Reason of the problem might even be
  completely different.

  ProblemType: Bug
  DistroRelease: Ubuntu 11.04
  Package: nautilus 1:2.32.2.1-0ubuntu13
  ProcVersionSignature: Ubuntu 2.6.38-8.42-generic-pae 2.6.38.2
  Uname: Linux 2.6.38-8-generic-pae i686
  Architecture: i386
  Date: Thu Jun  2 23:40:08 2011
  InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release i386 (20110427.1)
  ProcEnviron:
   LANGUAGE=en_US:en
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: nautilus
  UpgradeStatus: No upgrade log present (probably fresh install)

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