usb disk or key always have two entries in explorer

[Gianluca Cecchi]

Hello,
running Fedora 18 with latest updates.
When I plug in an usb key or a usb disk I get two entries in file manager
as from this screenshot:
https://docs.google.com/file/d/0BwoPbcrMv8mvTEw5Sy1JMTk4aEE/edit

The first entry if I click gives this error as from this image:
https://docs.google.com/file/d/0BwoPbcrMv8mvOWJaQ3hHV1NNNFE/edit

The second one gives the authentication window and then I can access the
files.

In this case we are talking about an external 2.5" hard disk connected via
usb, where its partition layout is:

$ sudo fdisk -l /dev/sdc

Disk /dev/sdc: 500.1 GB, 500107862016 bytes, 976773168 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x0c964c48

   Device Boot      Start         End      Blocks   Id  System
/dev/sdc1              63   976768064   488384001   83  Linux


Against what do I have to bug?

Gianluca
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