** Description changed:

  I have an external hard drive (WD- my passport essential) that I have a same 
problem with three different computers already running Ubuntu 12.04 (and I had 
the same problem with previous versions 11.04 , 11.10). 
- Each time when I click on "Safely remove" button, after a few second, my hard 
disk re-mount again and even after several times repeating this process, still 
the external hard drive remounting automatically. 
+ Each time when I click on "Safely remove" button, after a few seconds, my 
hard disk re-mount again and even after several times repeating this process, 
still the external hard drive remount automatically. 
  I couldn't find any special solution in the Ubuntu forums and other websites 
and it seems it is a bug. here is the result of this command: lspci | grep USB
  
  Here is the information of the desktop (Dell-Vostro-410):
  00:1a.0 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI 
Controller #4 (rev 02)
  00:1a.1 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI 
Controller #5 (rev 02)
  00:1a.2 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI 
Controller #6 (rev 02)
  00:1a.7 USB Controller: Intel Corporation 82801I (ICH9 Family) USB2 EHCI 
Controller #2 (rev 02)
  00:1d.0 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI 
Controller #1 (rev 02)
  00:1d.1 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI 
Controller #2 (rev 02)
  00:1d.2 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI 
Controller #3 (rev 02)
  00:1d.7 USB Controller: Intel Corporation 82801I (ICH9 Family) USB2 EHCI 
Controller #1 (rev 02)
  
  And here is the information of my laptop:
  00:1d.0 USB Controller: Intel Corporation N10/ICH 7 Family USB UHCI 
Controller #1 (rev 02)
  00:1d.1 USB Controller: Intel Corporation N10/ICH 7 Family USB UHCI 
Controller #2 (rev 02)
  00:1d.2 USB Controller: Intel Corporation N10/ICH 7 Family USB UHCI 
Controller #3 (rev 02)
  00:1d.3 USB Controller: Intel Corporation N10/ICH 7 Family USB UHCI 
Controller #4 (rev 02)
  00:1d.7 USB Controller: Intel Corporation N10/ICH 7 Family USB2 EHCI 
Controller (rev 02)
  
  My othe laptop is also by Intel.
  --- 
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
  ApportVersion: 2.0.1-0ubuntu8
  Architecture: i386
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  elite      1818 F.... pulseaudio
   /dev/snd/pcmC0D0p:   elite      1818 F...m pulseaudio
  Card0.Amixer.info:
   Card hw:0 'Intel'/'HDA Intel at 0xf0b40000 irq 44'
     Mixer name : 'Realtek ALC861'
     Components : 'HDA:10ec0861,11791205,00100300 
HDA:11c13026,11790001,00100700'
     Controls      : 13
     Simple ctrls  : 8
  DistroRelease: Ubuntu 12.04
  HibernationDevice: RESUME=UUID=3c8eacf4-7900-4be2-a4eb-a87901043385
  InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release i386 
(20120423)
  MachineType: TOSHIBA Satellite A100
  Package: linux (not installed)
  PccardctlIdent:
   Socket 0:
     no product info available
  PccardctlStatus:
   Socket 0:
     no card
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-25-generic-pae 
root=UUID=7e543318-e77b-4152-ac35-0fa49793ae7d ro quiet splash vt.handoff=7
  ProcVersionSignature: Ubuntu 3.2.0-25.40-generic-pae 3.2.18
  RelatedPackageVersions:
   linux-restricted-modules-3.2.0-25-generic-pae N/A
   linux-backports-modules-3.2.0-25-generic-pae  N/A
   linux-firmware                                1.79
  RfKill:
   0: phy0: Wireless LAN
        Soft blocked: no
        Hard blocked: no
  SourcePackage: linux
  Tags:  precise precise
  Uname: Linux 3.2.0-25-generic-pae i686
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip disk lpadmin plugdev sambashare sudo vboxusers
  dmi.bios.date: 07/12/2007
  dmi.bios.vendor: Phoenix Technologies LTD
  dmi.bios.version: 6.00
  dmi.board.name: CAPELL VALLEY(NAPA) CRB
  dmi.board.vendor: Intel Corporation
  dmi.board.version: Not Applicable
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 1
  dmi.chassis.vendor: No Enclosure
  dmi.chassis.version: N/A
  dmi.modalias: 
dmi:bvnPhoenixTechnologiesLTD:bvr6.00:bd07/12/2007:svnTOSHIBA:pnSatelliteA100:pvrPSAA8C-0FH00E:rvnIntelCorporation:rnCAPELLVALLEY(NAPA)CRB:rvrNotApplicable:cvnNoEnclosure:ct1:cvrN/A:
  dmi.product.name: Satellite A100
  dmi.product.version: PSAA8C-0FH00E
  dmi.sys.vendor: TOSHIBA

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https://bugs.launchpad.net/bugs/1012773

Title:
  Remounting external Hard drive

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