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I can't turn off my external disk (western digital 1,5 TB).

Clicking on remove safely the HDD tries to turn off but it goes on a loop and after that it can't be mounted again without being unplugged.

I've this problem since I installed Ubuntu 12.04 (32 or 64 bit doesn't change) but before, under 10.04, it was perfect.

Actually I am on Ubuntu 12.04 64bit

      physical id: e
      bus info: usb@1:1
      logical name: scsi2
      capabilities: emulated scsi-host
      configuration: driver=usb-storage
         description: SCSI Disk
         physical id: 0.0.0
         bus info: scsi@2:0.0.0
         logical name: /dev/sdb
      physical id: f
      bus info: usb@2:1
      logical name: scsi11
      capabilities: emulated scsi-host
      configuration: driver=usb-storage
         description: SCSI Disk
         product: 15EADS External
         vendor: WD
         physical id: 0.0.0
         bus info: scsi@11:0.0.0
         logical name: /dev/sdc
         version: 1.75
         serial: WD-WMAVU0862390
         size: 1397GiB (1500GB)
         capabilities: partitioned partitioned:dos
         configuration: ansiversion=4 signature=000343d7
            description: Windows NTFS volume
            physical id: 1
            bus info: scsi@11:0.0.0,1
            logical name: /dev/sdc1
            logical name: /media/ESTERNO
            version: 3.1
            serial: 4282c828-d41d-9b44-8a57-bea2de558e27
            size: 1397GiB
            capacity: 1397GiB
            capabilities: primary ntfs initialized
            configuration: clustersize=4096 created=2009-09-11 13:36:33 filesystem=ntfs label=ESTERNO mount.fstype=fuseblk mount.options=rw,nosuid,nodev,relatime,user_id=0,group_id=0,default_permissions,​allow_other,blksize=4096 state=mounted
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