Partition showing up twice under devices

Question

Possible Duplicate:
Mounted drives appearing twice in lists

I have an NTFS data partition on the same drive as my Ubuntu 12.04 (Precise Pangolin) partition. I wanted to have this partition automatically mount at startup so that Dropbox can start synchronising at startup without me having to manually mount it (my Dropbox folder is on the partition). I edited the fstab file by appending the following to it:

#Data-Partition
UUID=762639DE416D0A21 /media/Data ntfs-3g rw,auto,users,exec,nls=utf8,umask=003,gid=46,uid=1000    0   2

The drive now automounts at startup like I wanted, but now I have a duplicate Data entry under my Devices list. This only appeared after editing the fstab file.

The second Data entry under Devices does not mount properly, and I do not want it there. Why is this duplicate entry there, and how can I get rid of it?

Additional information:

Here is the output I get from cat /proc/partitions:

major minor  #blocks  name
8        0  976762584 sda
   8        1     102400 sda1
   8        2  111574016 sda2
   8        3  803643392 sda3
   8        4          1 sda4
   8        5   55410688 sda5
   8        6    6028288 sda6
  11        0    1048575 sr0